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Garlatti E, Albino A, Chicco S, Nguyen VHA, Santanni F, Paolasini L, Mazzoli C, Caciuffo R, Totti F, Santini P, Sessoli R, Lunghi A, Carretta S. The critical role of ultra-low-energy vibrations in the relaxation dynamics of molecular qubits. Nat Commun 2023; 14:1653. [PMID: 36964152 PMCID: PMC10039010 DOI: 10.1038/s41467-023-36852-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 02/15/2023] [Indexed: 03/26/2023] Open
Abstract
Improving the performance of molecular qubits is a fundamental milestone towards unleashing the power of molecular magnetism in the second quantum revolution. Taming spin relaxation and decoherence due to vibrations is crucial to reach this milestone, but this is hindered by our lack of understanding on the nature of vibrations and their coupling to spins. Here we propose a synergistic approach to study a prototypical molecular qubit. It combines inelastic X-ray scattering to measure phonon dispersions along the main symmetry directions of the crystal and spin dynamics simulations based on DFT. We show that the canonical Debye picture of lattice dynamics breaks down and that intra-molecular vibrations with very-low energies of 1-2 meV are largely responsible for spin relaxation up to ambient temperature. We identify the origin of these modes, thus providing a rationale for improving spin coherence. The power and flexibility of our approach open new avenues for the investigation of magnetic molecules with the potential of removing roadblocks toward their use in quantum devices.
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Affiliation(s)
- E Garlatti
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma and UdR Parma, INSTM, I-43124, Parma, Italy
- INFN, Sezione di Milano-Bicocca, gruppo collegato di Parma, I-43124, Parma, Italy
| | - A Albino
- Dipartimento di Chimica 'Ugo Schiff', Università Degli Studi di Firenze and UdR Firenze, INSTM, I-50019, Sesto Fiorentino, Italy
| | - S Chicco
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma and UdR Parma, INSTM, I-43124, Parma, Italy
| | - V H A Nguyen
- School of Physics, AMBER and CRANN Institute, Trinity College, Dublin 2, Ireland
| | - F Santanni
- Dipartimento di Chimica 'Ugo Schiff', Università Degli Studi di Firenze and UdR Firenze, INSTM, I-50019, Sesto Fiorentino, Italy
| | - L Paolasini
- ESRF - The European Synchrotron Radiation Facility, F-38043, Grenoble, Cedex 09, France
| | - C Mazzoli
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - R Caciuffo
- INFN, Sezione di Genova, I-16146, Genova, Italy
| | - F Totti
- Dipartimento di Chimica 'Ugo Schiff', Università Degli Studi di Firenze and UdR Firenze, INSTM, I-50019, Sesto Fiorentino, Italy
| | - P Santini
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma and UdR Parma, INSTM, I-43124, Parma, Italy
- INFN, Sezione di Milano-Bicocca, gruppo collegato di Parma, I-43124, Parma, Italy
| | - R Sessoli
- Dipartimento di Chimica 'Ugo Schiff', Università Degli Studi di Firenze and UdR Firenze, INSTM, I-50019, Sesto Fiorentino, Italy.
| | - A Lunghi
- School of Physics, AMBER and CRANN Institute, Trinity College, Dublin 2, Ireland.
| | - S Carretta
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma and UdR Parma, INSTM, I-43124, Parma, Italy.
- INFN, Sezione di Milano-Bicocca, gruppo collegato di Parma, I-43124, Parma, Italy.
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Lawrence Bright E, Xu L, Harding LM, Springell R, Walters AC, Sundermann M, Garcia-Fernandez M, Agrestini S, Caciuffo R, van der Laan G, Lander GH. Resonant inelastic x-ray scattering from U 3O 8and UN. J Phys Condens Matter 2023; 35. [PMID: 36735967 DOI: 10.1088/1361-648x/acb8f4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 02/03/2023] [Indexed: 06/18/2023]
Abstract
Resonant inelastic x-ray scattering (RIXS) using an incident energy tuned to the uraniumN4,5absorption edges is reported from epitaxial films ofα-U3O8and UN. Theory shows that for U3O8the multiplets associated with a 5f1configuration with a ground state of2F5/2and the excited state of2F7/2are observed. However, the strong transition predicted at a transfer energy of 1.67 eV is not observed. We assume this is a consequence of the intermediate state lifetime broadening due to interaction with continuum states when the transferred energy exceeds the onset of the continuum in the presence of the core hole. This hypothesis is supported by the results obtained for the 5f-itinerant system UN, where no sharp transitions have been observed, although the broad scattering response centred at ∼1 eV is considered a signature of a predominantly 5f3configuration in this band-like semi-metallic system. These experiments and theory add important information on these materials, both of which have been investigated since the 1960s, as well as whether RIXS at the uraniumNedge can become a valuable tool for actinide research.
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Affiliation(s)
| | - Lei Xu
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87544, United States of America
| | - Lottie M Harding
- University of Bristol, HH Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
| | - Ross Springell
- University of Bristol, HH Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
| | - Andrew C Walters
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
| | - Martin Sundermann
- Institute of Physics II, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
- Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, 01187 Dresden, Germany
| | - Mirian Garcia-Fernandez
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
| | - Stefano Agrestini
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
| | - Roberto Caciuffo
- European Commission, Joint Research Centre, Postfach 2340, D-76125 Karlsruhe, Germany
- Istituto Nazionale di Fisica Nucleare, Via Dodecaneso 33, IT-16146 Genova, Italy
| | - Gerrit van der Laan
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
| | - Gerard H Lander
- University of Bristol, HH Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
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3
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Zasimov P, Amidani L, Retegan M, Walter O, Caciuffo R, Kvashnina KO. HERFD-XANES and RIXS Study on the Electronic Structure of Trivalent Lanthanides across a Series of Isostructural Compounds. Inorg Chem 2022; 61:1817-1830. [PMID: 35051333 PMCID: PMC8808409 DOI: 10.1021/acs.inorgchem.1c01525] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
We performed a systematic
study of the complexes of trivalent lanthanide
cations with the hydridotris(1-pyrazolyl)borato (Tp) ligand (LnTp3; Ln = La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and
Lu) using both high-energy-resolution fluorescence-detected X-ray
absorption near-edge structure (HERFD-XANES) and resonant inelastic
X-ray scattering (RIXS) at the lanthanide L3 absorption
edge. Here, we report the results obtained and we discuss them against
calculations performed using density functional theory (DFT) and atomic
multiplet theory. The spectral shape and the elemental trends observed
in the experimental HERFD-XANES spectra are well reproduced by DFT
calculations, while the pre-edge energy interval is better described
by atomic multiplet theory. The RIXS data show a generally rather
complex pattern that originates from the intra-atomic electron–electron
interactions in the intermediate and final states, as demonstrated
by the good agreement obtained with calculations using an atomic-only
model of the absorber. Guided by theoretical predictions, we discuss
the possible origins of the observed spectral features and the trends
in energy splitting across the series. The insight into the electronic
structure of trivalent lanthanide compounds demonstrated here and
obtained with advanced X-ray spectroscopies coupled with theoretical
calculations can be applied to any lanthanide-bearing compound and
be of great interest for all research fields involving lanthanides. This work represents a systematic investigation
of the complexes
of trivalent lanthanide cations with the hydridotris(1-pyrazolyl)borato
(Tp) ligand (LnTp3; Ln = La, Ce, Pr, Nd, Sm, Eu, Tb, Dy,
Ho, Er, Tm, Yb, and Lu) using both high-energy-resolution fluorescence-detected
X-ray absorption near-edge structure and resonant inelastic X-ray
scattering at the lanthanide L3 absorption edge. The experimental
results are discussed against the calculations performed with the
density functional theory and atomic multiplet theory approaches.
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Affiliation(s)
- Pavel Zasimov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Lucia Amidani
- The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France.,Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), P.O. Box 510119, 01314 Dresden, Germany
| | - Marius Retegan
- ESRF─The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
| | - Olaf Walter
- European Commission, Joint Research Centre, Postfach 2340, 76215 Karlsruhe, Germany
| | - Roberto Caciuffo
- European Commission, Joint Research Centre, Postfach 2340, 76215 Karlsruhe, Germany
| | - Kristina O Kvashnina
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.,The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France.,Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), P.O. Box 510119, 01314 Dresden, Germany
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Caciuffo R, Lander GH. X-ray synchrotron radiation studies of actinide materials. J Synchrotron Radiat 2021; 28:1692-1708. [PMID: 34738923 PMCID: PMC8570219 DOI: 10.1107/s1600577521009413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 09/09/2021] [Indexed: 06/13/2023]
Abstract
By reviewing a selection of X-ray diffraction (XRD), resonant X-ray scattering (RXS), X-ray magnetic circular dichroism (XMCD), resonant and non-resonant inelastic scattering (RIXS, NIXS), and dispersive inelastic scattering (IXS) experiments, the potential of synchrotron radiation techniques in studying lattice and electronic structure, hybridization effects, multipolar order and lattice dynamics in actinide materials is demonstrated.
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Affiliation(s)
- Roberto Caciuffo
- European Commission, Joint Research Centre, Postfach 2340, D-76125 Karlsruhe, Germany
| | - Gerard H. Lander
- European Commission, Joint Research Centre, Postfach 2340, D-76125 Karlsruhe, Germany
- Interface Analysis Centre, School of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
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Lander GH, Sundermann M, Springell R, Walters AC, Nag A, Garcia-Fernandez M, Zhou KJ, van der Laan G, Caciuffo R. Resonant inelastic x-ray spectroscopy on UO 2 as a test case for actinide materials. J Phys Condens Matter 2021; 33:06LT01. [PMID: 33325375 DOI: 10.1088/1361-648x/abc4d2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Resonant inelastic x-ray spectroscopy at the uranium N4 absorption edge at 778 eV has been used to reveal the excitations in UO2 up to 1 eV. The earlier (1989) studies by neutron inelastic scattering of the crystal-field states within the 3H4 multiplet are confirmed. In addition, the first excited state of the 3F2 multiplet at ∼520 meV has been established, and there is a weak signal corresponding to the next excited state at ∼920 meV. This represents a successful application of soft x-ray spectroscopy to an actinide sample, and resolves an open question in UO2 that has been discussed for 50 years. The technique is described and important caveats are drawn about possible future applications.
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Affiliation(s)
- G H Lander
- European Commission, Joint Research Centre (JRC), Postfach 2340, D-76125 Karlsruhe, Germany
- Interface Analysis Centre, School of Physics, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
| | - M Sundermann
- Institute of Physics II, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
- Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, 01187 Dresden, Germany
| | - R Springell
- Interface Analysis Centre, School of Physics, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
| | - A C Walters
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - A Nag
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - M Garcia-Fernandez
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - K J Zhou
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - G van der Laan
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - R Caciuffo
- European Commission, Joint Research Centre (JRC), Postfach 2340, D-76125 Karlsruhe, Germany
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Apostolidis C, Kovács A, Walter O, Colineau E, Griveau J, Morgenstern A, Rebizant J, Caciuffo R, Panak PJ, Rabung T, Schimmelpfennig B, Perfetti M. Tris-{hydridotris(1-pyrazolyl)borato}actinide Complexes: Synthesis, Spectroscopy, Crystal Structure, Bonding Properties and Magnetic Behaviour. Chemistry 2020; 26:11293-11306. [PMID: 32519790 PMCID: PMC7497007 DOI: 10.1002/chem.202001095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/26/2020] [Indexed: 01/10/2023]
Abstract
The isostructural compounds of the trivalent actinides uranium, neptunium, plutonium, americium, and curium with the hydridotris(1-pyrazolyl)borato (Tp) ligand An[η3 -HB(N2 C3 H3 )3 ]3 (AnTp3 ) have been obtained through several synthetic routes. Structural, spectroscopic (absorption, infrared, laser fluorescence) and magnetic characterisation of the compounds were performed in combination with crystal field, density functional theory (DFT) and relativistic multiconfigurational calculations. The covalent bonding interactions were analysed in terms of the natural bond orbital (NBO) and quantum theory of atoms in molecules (QTAIM) models.
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Affiliation(s)
| | - Attila Kovács
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Olaf Walter
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Eric Colineau
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | | | - Alfred Morgenstern
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Jean Rebizant
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Roberto Caciuffo
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Petra J. Panak
- Institut für Nukleare EntsorgungForschungszentrum KarlsruhePostfach 364076021KarlsruheGermany
| | - Thomas Rabung
- Institut für Nukleare EntsorgungForschungszentrum KarlsruhePostfach 364076021KarlsruheGermany
| | - Bernd Schimmelpfennig
- Institut für Nukleare EntsorgungForschungszentrum KarlsruhePostfach 364076021KarlsruheGermany
| | - Mauro Perfetti
- Department of ChemistryUniversity of CopenhagenUniversitetsparken 52100CopenhagenDenmark
- Department of Chemistry “Ugo Schiff” and INSTM Research UnitUniversity of FlorenceVia della Lastruccia 350019Sesto FiorentinoItaly
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7
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Lander GH, Caciuffo R. The fifty years it has taken to understand the dynamics of UO 2in its ordered state. J Phys Condens Matter 2020; 32:374001. [PMID: 31035272 DOI: 10.1088/1361-648x/ab1dc5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 04/29/2019] [Indexed: 06/09/2023]
Abstract
In 1966 Roger Cowley (together with Gerald Dolling) reported the first neutron inelastic scattering from the magnetic excitations from UO2below its antiferromagnetic ordering temperature of 30 K. They showed the strong magnon-phonon coupling in this material and that the excitations appeared to contain an additional mode that was not anticipated. Cowley never returned to UO2, but showed a keen interest in the developments. Forty years after this pioneering work, unambiguous evidence was found (using resonance x-ray techniques) for the ordering belowTNof the electric quadrupoles involving the anisotropy of the 5f chargedistribution around the uranium nuclei. A further 10 years later, now armed with a full theory for the excitation spectrum expected for phonons, magnons, and quadrupoles, we can identify the latter as the source of the 'extra' mode reported first in 1966. The story is a long winding one, with the expected serendipity and dead ends, but is now (almost) completed.
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Affiliation(s)
- G H Lander
- European Commission, Joint Research Centre, Postfach 2340, D-76125 Karlsruhe, Germany
| | - R Caciuffo
- European Commission, Joint Research Centre, Postfach 2340, D-76125 Karlsruhe, Germany
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8
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Caciuffo R, Fazio C, Guet C. Generation-IV nuclear reactor systems. EPJ Web Conf 2020. [DOI: 10.1051/epjconf/202024600011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this paper, we provide a concise description of the six nuclear reactor concepts that are under development in the framework of the Generation-IV International Forum. After a brief introduction on the world energy needs, its plausible evolution during the next fifty years, and the constraints imposed by the necessity to address the climate challenges we are facing today, we will present the main features of the innovative nuclear energy systems that hold the promise to produce almost-zero-carbon-emission electricity, heat for chemistry and industrial manufacturing, hydrogen to be used as energy vector, and affordable freshwater. Potential advantages over currently available nuclear systems in terms of increased safety, reduced proliferation risks, economical affordability, sustainability of the fuel cycle, and management of the waste inventory will be critically discussed against the technical challenges that remain to be overcome.
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Kvashnina KO, Romanchuk AY, Pidchenko I, Amidani L, Gerber E, Trigub A, Rossberg A, Weiss S, Popa K, Walter O, Caciuffo R, Scheinost AC, Butorin SM, Kalmykov SN. Rücktitelbild: A Novel Metastable Pentavalent Plutonium Solid Phase on the Pathway from Aqueous Plutonium(VI) to PuO
2
Nanoparticles (Angew. Chem. 49/2019). Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201913777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kristina O. Kvashnina
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Anna Yu. Romanchuk
- Department of ChemistryLomonosov Moscow State University 119991 Moscow Russia
| | - Ivan Pidchenko
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Lucia Amidani
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Evgeny Gerber
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
- Department of ChemistryLomonosov Moscow State University 119991 Moscow Russia
| | - Alexander Trigub
- National Research Centre “Kurchatov Institute” 123182 Moscow Russia
| | - Andre Rossberg
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Stephan Weiss
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Karin Popa
- Directorate for Nuclear Safety and SecurityEuropean Commission, Joint Research Centre Postfach 2340 76215 Karlsruhe Germany
| | - Olaf Walter
- Directorate for Nuclear Safety and SecurityEuropean Commission, Joint Research Centre Postfach 2340 76215 Karlsruhe Germany
| | - Roberto Caciuffo
- Directorate for Nuclear Safety and SecurityEuropean Commission, Joint Research Centre Postfach 2340 76215 Karlsruhe Germany
| | - Andreas C. Scheinost
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Sergei M. Butorin
- Department of Physics and AstronomyMolecular and Condensed Matter PhysicsUppsala University P.O. Box 516 Uppsala Sweden
| | - Stepan N. Kalmykov
- Department of ChemistryLomonosov Moscow State University 119991 Moscow Russia
- National Research Centre “Kurchatov Institute” 123182 Moscow Russia
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10
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Kvashnina KO, Romanchuk AY, Pidchenko I, Amidani L, Gerber E, Trigub A, Rossberg A, Weiss S, Popa K, Walter O, Caciuffo R, Scheinost AC, Butorin SM, Kalmykov SN. Back Cover: A Novel Metastable Pentavalent Plutonium Solid Phase on the Pathway from Aqueous Plutonium(VI) to PuO
2
Nanoparticles (Angew. Chem. Int. Ed. 49/2019). Angew Chem Int Ed Engl 2019. [DOI: 10.1002/anie.201913777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kristina O. Kvashnina
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Anna Yu. Romanchuk
- Department of ChemistryLomonosov Moscow State University 119991 Moscow Russia
| | - Ivan Pidchenko
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Lucia Amidani
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Evgeny Gerber
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
- Department of ChemistryLomonosov Moscow State University 119991 Moscow Russia
| | - Alexander Trigub
- National Research Centre “Kurchatov Institute” 123182 Moscow Russia
| | - Andre Rossberg
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Stephan Weiss
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Karin Popa
- Directorate for Nuclear Safety and SecurityEuropean Commission, Joint Research Centre Postfach 2340 76215 Karlsruhe Germany
| | - Olaf Walter
- Directorate for Nuclear Safety and SecurityEuropean Commission, Joint Research Centre Postfach 2340 76215 Karlsruhe Germany
| | - Roberto Caciuffo
- Directorate for Nuclear Safety and SecurityEuropean Commission, Joint Research Centre Postfach 2340 76215 Karlsruhe Germany
| | - Andreas C. Scheinost
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Sergei M. Butorin
- Department of Physics and AstronomyMolecular and Condensed Matter PhysicsUppsala University P.O. Box 516 Uppsala Sweden
| | - Stepan N. Kalmykov
- Department of ChemistryLomonosov Moscow State University 119991 Moscow Russia
- National Research Centre “Kurchatov Institute” 123182 Moscow Russia
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11
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Kvashnina KO, Romanchuk AY, Pidchenko I, Amidani L, Gerber E, Trigub A, Rossberg A, Weiss S, Popa K, Walter O, Caciuffo R, Scheinost AC, Butorin SM, Kalmykov SN. A Novel Metastable Pentavalent Plutonium Solid Phase on the Pathway from Aqueous Plutonium(VI) to PuO
2
Nanoparticles. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201911637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kristina O. Kvashnina
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Anna Yu. Romanchuk
- Department of ChemistryLomonosov Moscow State University 119991 Moscow Russia
| | - Ivan Pidchenko
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Lucia Amidani
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Evgeny Gerber
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
- Department of ChemistryLomonosov Moscow State University 119991 Moscow Russia
| | - Alexander Trigub
- National Research Centre “Kurchatov Institute” 123182 Moscow Russia
| | - Andre Rossberg
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Stephan Weiss
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Karin Popa
- Directorate for Nuclear Safety and SecurityEuropean Commission, Joint Research Centre Postfach 2340 76215 Karlsruhe Germany
| | - Olaf Walter
- Directorate for Nuclear Safety and SecurityEuropean Commission, Joint Research Centre Postfach 2340 76215 Karlsruhe Germany
| | - Roberto Caciuffo
- Directorate for Nuclear Safety and SecurityEuropean Commission, Joint Research Centre Postfach 2340 76215 Karlsruhe Germany
| | - Andreas C. Scheinost
- Institute of Resource EcologyHelmholtz Zentrum Dresden-Rossendorf (HZDR) PO Box 510119 01314 Dresden Germany
- The Rossendorf Beamline at ESRFThe European Synchrotron, CS40220 38043 Grenoble Cedex 9 France
| | - Sergei M. Butorin
- Department of Physics and AstronomyMolecular and Condensed Matter PhysicsUppsala University P.O. Box 516 Uppsala Sweden
| | - Stepan N. Kalmykov
- Department of ChemistryLomonosov Moscow State University 119991 Moscow Russia
- National Research Centre “Kurchatov Institute” 123182 Moscow Russia
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12
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Kvashnina KO, Romanchuk AY, Pidchenko I, Amidani L, Gerber E, Trigub A, Rossberg A, Weiss S, Popa K, Walter O, Caciuffo R, Scheinost AC, Butorin SM, Kalmykov SN. A Novel Metastable Pentavalent Plutonium Solid Phase on the Pathway from Aqueous Plutonium(VI) to PuO 2 Nanoparticles. Angew Chem Int Ed Engl 2019; 58:17558-17562. [PMID: 31621992 PMCID: PMC6900038 DOI: 10.1002/anie.201911637] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Indexed: 11/10/2022]
Abstract
Here we provide evidence that the formation of PuO2 nanoparticles from oxidized PuVI under alkaline conditions proceeds through the formation of an intermediate PuV solid phase, similar to NH4PuO2CO3, which is stable over a period of several months. For the first time, state‐of‐the‐art experiments at Pu M4 and at L3 absorption edges combined with theoretical calculations unambiguously allow to determine the oxidation state and the local structure of this intermediate phase.
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Affiliation(s)
- Kristina O Kvashnina
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), PO Box 510119, 01314, Dresden, Germany.,The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043, Grenoble Cedex 9, France
| | - Anna Yu Romanchuk
- Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia
| | - Ivan Pidchenko
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), PO Box 510119, 01314, Dresden, Germany.,The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043, Grenoble Cedex 9, France
| | - Lucia Amidani
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), PO Box 510119, 01314, Dresden, Germany.,The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043, Grenoble Cedex 9, France
| | - Evgeny Gerber
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), PO Box 510119, 01314, Dresden, Germany.,The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043, Grenoble Cedex 9, France.,Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia
| | - Alexander Trigub
- National Research Centre "Kurchatov Institute", 123182, Moscow, Russia
| | - Andre Rossberg
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), PO Box 510119, 01314, Dresden, Germany.,The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043, Grenoble Cedex 9, France
| | - Stephan Weiss
- The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043, Grenoble Cedex 9, France
| | - Karin Popa
- Directorate for Nuclear Safety and Security, European Commission, Joint Research Centre, Postfach 2340, 76215, Karlsruhe, Germany
| | - Olaf Walter
- Directorate for Nuclear Safety and Security, European Commission, Joint Research Centre, Postfach 2340, 76215, Karlsruhe, Germany
| | - Roberto Caciuffo
- Directorate for Nuclear Safety and Security, European Commission, Joint Research Centre, Postfach 2340, 76215, Karlsruhe, Germany
| | - Andreas C Scheinost
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), PO Box 510119, 01314, Dresden, Germany.,The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043, Grenoble Cedex 9, France
| | - Sergei M Butorin
- Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University, P.O. Box 516, Uppsala, Sweden
| | - Stepan N Kalmykov
- Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia.,National Research Centre "Kurchatov Institute", 123182, Moscow, Russia
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13
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Gouder T, Huber F, Eloirdi R, Caciuffo R. U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen. J Vis Exp 2019. [PMID: 30855566 DOI: 10.3791/59017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
We describe a method to produce U2O5 films in situ using the Labstation, a modular machine developed at JRC Karlsruhe. The Labstation, an essential part of the Properties of Actinides under Extreme Conditions laboratory (PAMEC), allows the preparation of films and studies of sample surfaces using surface analytical techniques such as X-ray and ultra-violet photoemission spectroscopy (XPS and UPS, respectively). All studies are made in situ, and the films, transferred under ultra-high vacuum from their preparation to an analyses chamber, are never in contact with the atmosphere. Initially, a film of UO2 is prepared by direct current (DC) sputter deposition on a gold (Au) foil then oxidized by atomic oxygen to produce a UO3 film. This latter is then reduced with atomic hydrogen to U2O5. Analyses are performed after each step involving oxidation and reduction, using high-resolution photoelectron spectroscopy to examine the oxidation state of uranium. Indeed, the oxidation and reduction times and corresponding temperature of the substrate during this process have severe effects on the resulting oxidation state of the uranium. Stopping the reduction of UO3 to U2O5 with single U(V) is quite challenging; first, uranium-oxygen systems exist in numerous intermediate phases. Second, differentiation of the oxidation states of uranium is mainly based on satellite peaks, whose intensity peaks are weak. Also, experimenters should be aware that X-ray spectroscopy (XPS) is a technique with an atomic sensitivity of 1% to 5%. Thus, it is important to obtain a complete picture of the uranium oxidation state with the entire spectra obtained on U4f, O1s, and the valence band (VB). Programs used in the Labstation include a linear transfer program developed by an outside company (see Table of Materials) as well as data acquisition and sputter source programs, both developed in-house.
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Affiliation(s)
- Thomas Gouder
- European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security
| | - Frank Huber
- European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security
| | - Rachel Eloirdi
- European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security;
| | - Roberto Caciuffo
- European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security
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14
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Magnani N, Eloirdi R, Wilhelm F, Colineau E, Griveau JC, Shick AB, Lander GH, Rogalev A, Caciuffo R. Probing Magnetism in the Vortex Phase of PuCoGa_{5} by X-Ray Magnetic Circular Dichroism. Phys Rev Lett 2017; 119:157204. [PMID: 29077471 DOI: 10.1103/physrevlett.119.157204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Indexed: 06/07/2023]
Abstract
We measure x-ray magnetic circular dichroism (XMCD) spectra at the Pu M_{4,5} absorption edges from a newly prepared high-quality single crystal of the heavy-fermion superconductor ^{242}PuCoGa_{5}, exhibiting a critical temperature T_{c}=18.7 K. The experiment probes the vortex phase below T_{c} and shows that an external magnetic field induces a Pu 5f magnetic moment at 2 K equal to the temperature-independent moment measured in the normal phase up to 300 K by a superconducting quantum interference device. This observation is in agreement with theoretical models claiming that the Pu atoms in PuCoGa_{5} have a nonmagnetic singlet ground state resulting from the hybridization of the conduction electrons with the intermediate-valence 5f electronic shell. Unexpectedly, XMCD spectra show that the orbital component of the 5f magnetic moment increases significantly between 30 and 2 K; the antiparallel spin component increases as well, leaving the total moment practically constant. We suggest that this indicates a low-temperature breakdown of the complete Kondo-like screening of the local 5f moment.
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Affiliation(s)
- N Magnani
- European Commission, Joint Research Centre (JRC), Directorate for Nuclear Safety and Security, Postfach 2340, D-76125 Karlsruhe, Germany
| | - R Eloirdi
- European Commission, Joint Research Centre (JRC), Directorate for Nuclear Safety and Security, Postfach 2340, D-76125 Karlsruhe, Germany
| | - F Wilhelm
- European Synchrotron Radiation Facility (ESRF), B.P.220, F-38043 Grenoble, France
| | - E Colineau
- European Commission, Joint Research Centre (JRC), Directorate for Nuclear Safety and Security, Postfach 2340, D-76125 Karlsruhe, Germany
| | - J-C Griveau
- European Commission, Joint Research Centre (JRC), Directorate for Nuclear Safety and Security, Postfach 2340, D-76125 Karlsruhe, Germany
| | - A B Shick
- Institute of Physics, ASCR, Na Slovance 2, CZ-18221 Prague, Czech Republic
| | - G H Lander
- European Commission, Joint Research Centre (JRC), Directorate for Nuclear Safety and Security, Postfach 2340, D-76125 Karlsruhe, Germany
| | - A Rogalev
- European Synchrotron Radiation Facility (ESRF), B.P.220, F-38043 Grenoble, France
| | - R Caciuffo
- European Commission, Joint Research Centre (JRC), Directorate for Nuclear Safety and Security, Postfach 2340, D-76125 Karlsruhe, Germany
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15
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Arnold PL, Cowie BE, Suvova M, Zegke M, Magnani N, Colineau E, Griveau JC, Caciuffo R, Love JB. Axially Symmetric U−O−Ln- and U−O−U-Containing Molecules from the Control of Uranyl Reduction with Simple f-Block Halides. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705197] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Polly L. Arnold
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Bradley E. Cowie
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Markéta Suvova
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Markus Zegke
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Nicola Magnani
- European Commission; Directorate for Nuclear Safety and Security, Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Eric Colineau
- European Commission; Directorate for Nuclear Safety and Security, Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Jean-Christophe Griveau
- European Commission; Directorate for Nuclear Safety and Security, Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Roberto Caciuffo
- European Commission; Directorate for Nuclear Safety and Security, Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Jason B. Love
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
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16
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Arnold PL, Cowie BE, Suvova M, Zegke M, Magnani N, Colineau E, Griveau JC, Caciuffo R, Love JB. Axially Symmetric U-O-Ln- and U-O-U-Containing Molecules from the Control of Uranyl Reduction with Simple f-Block Halides. Angew Chem Int Ed Engl 2017; 56:10775-10779. [PMID: 28686336 PMCID: PMC5697649 DOI: 10.1002/anie.201705197] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 06/23/2017] [Indexed: 11/08/2022]
Abstract
The reduction of UVI uranyl halides or amides with simple LnII or UIII salts forms highly symmetric, linear, oxo-bridged trinuclear UV /LnIII /UV , LnIII /UIV /LnIII , and UIV /UIV /UIV complexes or linear LnIII /UV polymers depending on the stoichiometry and solvent. The reactions can be tuned to give the products of one- or two-electron uranyl reduction. The reactivity and magnetism of these compounds are discussed in the context of using a series of strongly oxo-coupled homo- and heterometallic poly(f-block) chains to better understand fundamental electronic structure in the f-block.
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Affiliation(s)
- Polly L Arnold
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Bradley E Cowie
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Markéta Suvova
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Markus Zegke
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Nicola Magnani
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Eric Colineau
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Jean-Christophe Griveau
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Roberto Caciuffo
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Jason B Love
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
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17
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Arnold PL, Dutkiewicz MS, Zegke M, Walter O, Apostolidis C, Hollis E, Pécharman AF, Magnani N, Griveau JC, Colineau E, Caciuffo R, Zhang X, Schreckenbach G, Love JB. Subtle Interactions and Electron Transfer between UIII
, NpIII
, or PuIII
and Uranyl Mediated by the Oxo Group. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Polly L. Arnold
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Michał S. Dutkiewicz
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
- European Commission; Directorate for Nuclear Safety and Security; Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Markus Zegke
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Olaf Walter
- European Commission; Directorate for Nuclear Safety and Security; Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Christos Apostolidis
- European Commission; Directorate for Nuclear Safety and Security; Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Emmalina Hollis
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | | | - Nicola Magnani
- European Commission; Directorate for Nuclear Safety and Security; Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Jean-Christophe Griveau
- European Commission; Directorate for Nuclear Safety and Security; Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Eric Colineau
- European Commission; Directorate for Nuclear Safety and Security; Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Roberto Caciuffo
- European Commission; Directorate for Nuclear Safety and Security; Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Xiaobin Zhang
- Department of Chemistry; University of Manitoba; Winnipeg Manitoba R3T 2N2 Canada
| | - Georg Schreckenbach
- Department of Chemistry; University of Manitoba; Winnipeg Manitoba R3T 2N2 Canada
| | - Jason B. Love
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
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18
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Arnold PL, Dutkiewicz MS, Zegke M, Walter O, Apostolidis C, Hollis E, Pécharman AF, Magnani N, Griveau JC, Colineau E, Caciuffo R, Zhang X, Schreckenbach G, Love JB. Subtle Interactions and Electron Transfer between U(III) , Np(III) , or Pu(III) and Uranyl Mediated by the Oxo Group. Angew Chem Int Ed Engl 2016; 55:12797-801. [PMID: 27628291 DOI: 10.1002/anie.201607022] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Indexed: 11/08/2022]
Abstract
A dramatic difference in the ability of the reducing An(III) center in AnCp3 (An=U, Np, Pu; Cp=C5 H5 ) to oxo-bind and reduce the uranyl(VI) dication in the complex [(UO2 )(THF)(H2 L)] (L="Pacman" Schiff-base polypyrrolic macrocycle), is found and explained. These are the first selective functionalizations of the uranyl oxo by another actinide cation. At-first contradictory electronic structural data are explained by combining theory and experiment. Complete one-electron transfer from Cp3 U forms the U(IV) -uranyl(V) compound that behaves as a U(V) -localized single molecule magnet below 4 K. The extent of reduction by the Cp3 Np group upon oxo-coordination is much less, with a Np(III) -uranyl(VI) dative bond assigned. Solution NMR and NIR spectroscopy suggest Np(IV) U(V) but single-crystal X-ray diffraction and SQUID magnetometry suggest a Np(III) -U(VI) assignment. DFT-calculated Hirshfeld charge and spin density analyses suggest half an electron has transferred, and these explain the strongly shifted NMR spectra by spin density contributions at the hydrogen nuclei. The Pu(III) -U(VI) interaction is too weak to be observed in THF solvent, in agreement with calculated predictions.
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Affiliation(s)
- Polly L Arnold
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK.
| | - Michał S Dutkiewicz
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK.,European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Markus Zegke
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Olaf Walter
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Christos Apostolidis
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Emmalina Hollis
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | | | - Nicola Magnani
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Jean-Christophe Griveau
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Eric Colineau
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Roberto Caciuffo
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany.
| | - Xiaobin Zhang
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Georg Schreckenbach
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.
| | - Jason B Love
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK.
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19
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Smith AL, Hen A, Magnani N, Sanchez JP, Colineau E, Griveau JC, Raison PE, Caciuffo R, Konings RJM, Cheetham AK. Mössbauer spectroscopy, magnetization, magnetic susceptibility, and low temperature heat capacity of α-Na₂NpO₄. J Phys Condens Matter 2016; 28:086002. [PMID: 26823458 DOI: 10.1088/0953-8984/28/8/086002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The physical and chemical properties at low temperatures of hexavalent disodium neptunate α-Na2NpO4 are investigated for the first time in this work using Mössbauer spectroscopy, magnetization, magnetic susceptibility, and heat capacity measurements. The Np(VI) valence state is confirmed by the isomer shift value of the Mössbauer spectra, and the local structural environment around the neptunium cation is related to the fitted quadrupole coupling constant and asymmetry parameters. Moreover, magnetic hyperfine splitting is reported below 12.5 K, which could indicate magnetic ordering at this temperature. This interpretation is further substantiated by the existence of a λ-peak at 12.5 K in the heat capacity curve, which is shifted to lower temperatures with the application of a magnetic field, suggesting antiferromagnetic ordering. However, the absence of any anomaly in the magnetization and magnetic susceptibility data shows that the observed transition is more intricate. In addition, the heat capacity measurements suggest the existence of a Schottky-type anomaly above 15 K associated with a low-lying electronic doublet found about 60 cm(-1) above the ground state doublet. The possibility of a quadrupolar transition associated with a ground state pseudoquartet is thereafter discussed. The present results finally bring new insights into the complex magnetic and electronic peculiarities of α-Na2NpO4.
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Affiliation(s)
- Anna L Smith
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), PO Box 2340, D-76125 Karlsruhe, Germany. Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
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20
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Smith AL, Hen A, Raison PE, Colineau E, Griveau JC, Magnani N, Sanchez JP, Konings RJM, Caciuffo R, Cheetham AK. X-ray Diffraction, Mössbauer Spectroscopy, Magnetic Susceptibility, and Specific Heat Investigations of Na4NpO5 and Na5NpO6. Inorg Chem 2015; 54:4556-64. [DOI: 10.1021/acs.inorgchem.5b00462] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anna L. Smith
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
| | - Amir Hen
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Philippe E. Raison
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Eric Colineau
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Jean-Christophe Griveau
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Nicola Magnani
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Jean-Pierre Sanchez
- CEA, INAC-SPSMS, FR-38000 Grenoble, France
- Université de Grenoble Alpes, INAC-SPSMS, FR-38000 Grenoble, France
| | - Rudy J. M. Konings
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Roberto Caciuffo
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Anthony K. Cheetham
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
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Magnani N, Caciuffo R, Wilhelm F, Colineau E, Eloirdi R, Griveau JC, Rusz J, Oppeneer PM, Rogalev A, Lander GH. Magnetic polarization of the americium J=0 ground state in AmFe(2). Phys Rev Lett 2015; 114:097203. [PMID: 25793847 DOI: 10.1103/physrevlett.114.097203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Indexed: 06/04/2023]
Abstract
Trivalent americium has a nonmagnetic (J=0) ground state arising from the cancellation of the orbital and spin moments. However, magnetism can be induced by a large molecular field if Am^{3+} is embedded in a ferromagnetic matrix. Using the technique of x-ray magnetic circular dichroism, we show that this is the case in AmFe_{2}. Since ⟨J_{z}⟩=0, the spin component is exactly twice as large as the orbital one, the total Am moment is opposite to that of Fe, and the magnetic dipole operator ⟨T_{z}⟩ can be determined directly; we discuss the progression of the latter across the actinide series.
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Affiliation(s)
- N Magnani
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany
| | - R Caciuffo
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany
| | - F Wilhelm
- European Synchrotron Radiation Facility (ESRF), Boîte Postale 220, F-38043 Grenoble, France
| | - E Colineau
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany
| | - R Eloirdi
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany
| | - J-C Griveau
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany
| | - J Rusz
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, S-75120 Uppsala, Sweden
| | - P M Oppeneer
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, S-75120 Uppsala, Sweden
| | - A Rogalev
- European Synchrotron Radiation Facility (ESRF), Boîte Postale 220, F-38043 Grenoble, France
| | - G H Lander
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, D-76125 Karlsruhe, Germany
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Gaczyński P, Klimczuk T, Walker H, Springell R, Colineau E, Eloirdi R, Griveau JC, Caciuffo R. (237)Np Mössbauer effect study on NpFeAsO. J Phys Condens Matter 2014; 26:156002. [PMID: 24675054 DOI: 10.1088/0953-8984/26/15/156002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report (237)Np Mössbauer measurements on NpFeAsO. The Np atoms were found to occupy only one crystallographic site. The value of the isomer shift (δ ∼ 9.1 mm s(-1) versus NpAl2) indicates a 5f(4) electronic configuration (Np(3+) ions). The magnetic ordering of the Np sublattice below 60 K is established and the saturated ordered magnetic moment is determined to be 1.73μB at 3.6 K. The unique set of hyperfine parameters exclude a modulated magnetic structure or spin waves on the Np site. The neptunium magnetic moments μNp are found to lie along the tetragonal c-axis.
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Affiliation(s)
- P Gaczyński
- European Commission, JRC, Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe, Germany. Institute of Physical and Theoretical Chemistry, Technische Universität Braunschweig, Hans-Sommer-Str. 10, D-38106 Braunschweig, Germany
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Mougel V, Chatelain L, Hermle J, Caciuffo R, Colineau E, Tuna F, Magnani N, de Geyer A, Pécaut J, Mazzanti M. A uranium-based UO2(+)-Mn2+ single-chain magnet assembled trough cation-cation interactions. Angew Chem Int Ed Engl 2014; 53:819-23. [PMID: 24311434 PMCID: PMC4232274 DOI: 10.1002/anie.201307366] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Indexed: 01/07/2023]
Abstract
Single-chain magnets (SCMs) are materials composed of magnetically isolated one-dimensional (1D) units exhibiting slow relaxation of magnetization. The occurrence of SCM behavior requires the fulfillment of stringent conditions for exchange and anisotropy interactions. Herein, we report the synthesis, the structure, and the magnetic characterization of the first actinide-containing SCM. The 5f-3d heterometallic 1D chains [{[UO2(salen)(py)][M(py)4](NO3)}]n, (M=Cd (1) and M=Mn (2); py=pyridine) are assembled trough cation-cation interaction from the reaction of the uranyl(V) complex [UO2(salen)py][Cp*2Co] (Cp*=pentamethylcyclopentadienyl) with Cd(NO3)2 or Mn(NO3)2 in pyridine. The infinite UMn chain displays a high relaxation barrier of 134±0.8 K (93±0.5 cm(-1)), probably as a result of strong intra-chain magnetic interactions combined with the high Ising anisotropy of the uranyl(V) dioxo group. It also exhibits an open magnetic hysteresis loop at T<6 K, with an impressive coercive field of 3.4 T at 2 K.
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Affiliation(s)
- Victor Mougel
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIBUMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France)
| | - Lucile Chatelain
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIBUMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France)
| | - Johannes Hermle
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIBUMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France)
| | - Roberto Caciuffo
- European CommissionJoint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, 76125 Karlsruhe (Germany)
| | - Eric Colineau
- European CommissionJoint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, 76125 Karlsruhe (Germany)
| | - Floriana Tuna
- EPSRC UK EPR FacilitySchool of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL (UK)
| | - Nicola Magnani
- Institute of NanotechnologyKarlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen (Germany)
| | - Arnaud de Geyer
- Service Général des Rayons XSP2M, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France)
| | - Jacques Pécaut
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIBUMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France)
| | - Marinella Mazzanti
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIBUMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France)
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Magnani N, Colineau E, Griveau JC, Apostolidis C, Walter O, Caciuffo R. A plutonium-based single-molecule magnet. Chem Commun (Camb) 2014; 50:8171-3. [DOI: 10.1039/c4cc03400g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Mougel V, Chatelain L, Hermle J, Caciuffo R, Colineau E, Tuna F, Magnani N, de Geyer A, Pécaut J, Mazzanti M. A Uranium-Based UO2+-Mn2+Single-Chain Magnet Assembled trough Cation-Cation Interactions. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307366] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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26
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Carretta S, Amoretti G, Santini P, Mougel V, Mazzanti M, Gambarelli S, Colineau E, Caciuffo R. Magnetic properties and chiral states of a trimetallic uranium complex. J Phys Condens Matter 2013; 25:486001. [PMID: 24169692 DOI: 10.1088/0953-8984/25/48/486001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The magnetic properties of the triangular molecular nanomagnet [UO2L]3 (L = 2-(4-tolyl)-1,3-bis(quinolyl)malondiiminate) have been investigated through electron paramagnetic resonance spectroscopy, high-field magnetization and susceptibility measurements. The experimental findings are well reproduced by a microscopic model including exchange interactions and local crystal fields. These results show that [UO2L]3 is characterized by a non-magnetic ground doublet corresponding to two oppositely twisted chiral arrangements of the uranium moments. The non-axial character of single-ion crystal fields leads to quantum tunneling of the noncollinear magnetization in the presence of a magnetic field applied perpendicularly to the triangle plane.
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Affiliation(s)
- S Carretta
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, and Unità CNISM di Parma, Viale G P Usberti 7/A, I-43124 Parma, Italy
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27
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Arnold PL, Hollis E, Nichol GS, Love JB, Griveau JC, Caciuffo R, Magnani N, Maron L, Castro L, Yahia A, Odoh SO, Schreckenbach G. Oxo-functionalization and reduction of the uranyl ion through lanthanide-element bond homolysis: synthetic, structural, and bonding analysis of a series of singly reduced uranyl-rare earth 5f1-4f(n) complexes. J Am Chem Soc 2013; 135:3841-54. [PMID: 23451865 DOI: 10.1021/ja308993g] [Citation(s) in RCA: 101] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The heterobimetallic complexes [{UO2Ln(py)2(L)}2], combining a singly reduced uranyl cation and a rare-earth trication in a binucleating polypyrrole Schiff-base macrocycle (Pacman) and bridged through a uranyl oxo-group, have been prepared for Ln = Sc, Y, Ce, Sm, Eu, Gd, Dy, Er, Yb, and Lu. These compounds are formed by the single-electron reduction of the Pacman uranyl complex [UO2(py)(H2L)] by the rare-earth complexes Ln(III)(A)3 (A = N(SiMe3)2, OC6H3Bu(t)2-2,6) via homolysis of a Ln-A bond. The complexes are dimeric through mutual uranyl exo-oxo coordination but can be cleaved to form the trimetallic, monouranyl "ate" complexes [(py)3LiOUO(μ-X)Ln(py)(L)] by the addition of lithium halides. X-ray crystallographic structural characterization of many examples reveals very similar features for monomeric and dimeric series, the dimers containing an asymmetric U2O2 diamond core with shorter uranyl U═O distances than in the monomeric complexes. The synthesis by Ln(III)-A homolysis allows [5f(1)-4f(n)]2 and Li[5f(1)-4f(n)] complexes with oxo-bridged metal cations to be made for all possible 4f(n) configurations. Variable-temperature SQUID magnetometry and IR, NIR, and EPR spectroscopies on the complexes are utilized to provide a basis for the better understanding of the electronic structure of f-block complexes and their f-electron exchange interactions. Furthermore, the structures, calculated by restricted-core or all-electron methods, are compared along with the proposed mechanism of formation of the complexes. A strong antiferromagnetic coupling between the metal centers, mediated by the oxo groups, exists in the U(V)Sm(III) monomer, whereas the dimeric U(V)Dy(III) complex was found to show magnetic bistability at 3 K, a property required for the development of single-molecule magnets.
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Affiliation(s)
- Polly L Arnold
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King's Buildings, Edinburgh, EH9 3JJ, UK.
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28
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Prieur D, Pagliosa G, Spino J, Caciuffo R, Somers J, Eloirdi R. Thermal recovery and lattice expansion of self-irradiated U0.80Am0.20O2−x, an in situ high temperature x-ray diffraction study. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2012.12.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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29
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Bauer ED, Altarawneh MM, Tobash PH, Gofryk K, Ayala-Valenzuela OE, Mitchell JN, McDonald RD, Mielke CH, Ronning F, Griveau JC, Colineau E, Eloirdi R, Caciuffo R, Scott BL, Janka O, Kauzlarich SM, Thompson JD. Localized 5f electrons in superconducting PuCoIn₅: consequences for superconductivity in PuCoGa₅. J Phys Condens Matter 2012; 24:052206. [PMID: 22194040 DOI: 10.1088/0953-8984/24/5/052206] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The physical properties of the first In analog of the PuMGa(5) (M = Co, Rh) family of superconductors, PuCoIn(5), are reported. With its unit cell volume being 28% larger than that of PuCoGa(5), the characteristic spin-fluctuation energy scale of PuCoIn(5) is three to four times smaller than that of PuCoGa(5), which suggests that the Pu 5f electrons are in a more localized state relative to PuCoGa(5). This raises the possibility that the high superconducting transition temperature T(c) = 18.5 K of PuCoGa(5) stems from the proximity to a valence instability, while the superconductivity at T(c) = 2.5 K of PuCoIn(5) is mediated by antiferromagnetic spin fluctuations associated with a quantum critical point.
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Affiliation(s)
- E D Bauer
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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Sanchez JP, Aoki D, Eloirdi R, Gaczyński P, Griveau JC, Colineau E, Caciuffo R. Magnetic and electronic properties of NpFeGa5. J Phys Condens Matter 2011; 23:295601. [PMID: 21727311 DOI: 10.1088/0953-8984/23/29/295601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
NpFeGa(5) single crystals prepared by the Ga-flux method have been investigated by magnetisation, specific heat and (237)Np Mössbauer spectroscopy measurements. An antiferromagnetic (AF) transition has been observed at T(N) ~114 K. The second AF transition which takes place at T* ~74 K has only been detected in the magnetisation data. A saturated ordered Np moment of 1.00(5) μ(B) and the occurrence of an Np(3 + ) charge state were inferred from the Mössbauer data. The angle between the Np ordered moment and the basal plane was shown to be ~17°, in good agreement with the value observed by neutron diffraction in the low temperature AF phase. The absence of change of the quadrupole interaction parameters at T* did not allow us to gain information on the Np moment reorientation at T*. The trend of the isomer shift along the NpTGa(5) series and the discrepancy between the Np moments determined by neutron diffraction and Mössbauer spectroscopy indicated a partial spatial delocalisation of the 5f electrons in NpFeGa(5).
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Affiliation(s)
- J P Sanchez
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, France.
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Magnani N, Apostolidis C, Morgenstern A, Colineau E, Griveau JC, Bolvin H, Walter O, Caciuffo R. Magnetic Memory Effect in a Transuranic Mononuclear Complex. Angew Chem Int Ed Engl 2011; 50:1696-8. [DOI: 10.1002/anie.201006619] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Indexed: 11/08/2022]
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Magnani N, Apostolidis C, Morgenstern A, Colineau E, Griveau JC, Bolvin H, Walter O, Caciuffo R. Magnetic Memory Effect in a Transuranic Mononuclear Complex. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006619] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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Arnold PL, Hollis E, White FJ, Magnani N, Caciuffo R, Love JB. Single-Electron Uranyl Reduction by a Rare-Earth Cation. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201005511] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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Arnold PL, Hollis E, White FJ, Magnani N, Caciuffo R, Love JB. Single-electron uranyl reduction by a rare-earth cation. Angew Chem Int Ed Engl 2010; 50:887-90. [PMID: 21246684 DOI: 10.1002/anie.201005511] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Revised: 10/21/2010] [Indexed: 11/10/2022]
Affiliation(s)
- Polly L Arnold
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King's Buildings, West Mains Road, Edinburgh, EH9 3JJ, UK.
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Abstract
In presence of active orbital degrees of freedom, elementary excitations around a broken-symmetry state may include multipolar waves, but none of these exotic dispersive excitation branches has ever been identified. We show that quadrupolar waves constitute a major component of the dynamics of uranium dioxide in its magnetoquadrupolar ordered phase, and that many unexplained features in existing inelastic neutron scattering data, including a whole excitation branch, are associated with these propagating quadrupolar fluctuations. Our model permits us to separate the role of Jahn-Teller and superexchange mechanisms as sources of quadrupolar interactions.
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Affiliation(s)
- S Carretta
- Dipartimento di Fisica, Università di Parma, and Unità CNISM di Parma, Viale G. P. Usberti 7/A, I-43100 Parma, Italy
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Arnold PL, Potter NA, Magnani N, Apostolidis C, Griveau JC, Colineau E, Morgenstern A, Caciuffo R, Love JB. Synthesis of bimetallic uranium and neptunium complexes of a binucleating macrocycle and determination of the solid-state structure by magnetic analysis. Inorg Chem 2010; 49:5341-3. [PMID: 20503974 DOI: 10.1021/ic100374j] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Syntheses of the bimetallic uranium(III) and neptunium(III) complexes [(UI)(2)(L)], [(NpI)(2)(L)], and [{U(BH(4))}(2)(L)] of the Schiff-base pyrrole macrocycles L are described. In the absence of single-crystal structural data, fitting of the variable-temperature solid-state magnetic data allows the prediction of polymeric structures for these compounds in the solid state.
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Affiliation(s)
- Polly L Arnold
- School of Chemistry, University of Edinburgh, Edinburgh EH9 3JJ, UK.
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37
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Apostolidis C, Schimmelpfennig B, Magnani N, Lindqvist-Reis P, Walter O, Sykora R, Morgenstern A, Colineau E, Caciuffo R, Klenze R, Haire R, Rebizant J, Bruchertseifer F, Fanghänel T. Titelbild: [An(H2O)9](CF3SO3)3 (An=U-Cm, Cf): Exploring Their Stability, Structural Chemistry, and Magnetic Behavior by Experiment and Theory (Angew. Chem. 36/2010). Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201003226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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38
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Apostolidis C, Schimmelpfennig B, Magnani N, Lindqvist-Reis P, Walter O, Sykora R, Morgenstern A, Colineau E, Caciuffo R, Klenze R, Haire R, Rebizant J, Bruchertseifer F, Fanghänel T. [An(H2O)9](CF3SO3)3 (An=U-Cm, Cf): Exploring Their Stability, Structural Chemistry, and Magnetic Behavior by Experiment and Theory. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201001077] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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39
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Apostolidis C, Schimmelpfennig B, Magnani N, Lindqvist-Reis P, Walter O, Sykora R, Morgenstern A, Colineau E, Caciuffo R, Klenze R, Haire R, Rebizant J, Bruchertseifer F, Fanghänel T. [An(H2O)9](CF3SO3)3 (An=U-Cm, Cf): Exploring Their Stability, Structural Chemistry, and Magnetic Behavior by Experiment and Theory. Angew Chem Int Ed Engl 2010; 49:6343-7. [DOI: 10.1002/anie.201001077] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Magnani N, Colineau E, Eloirdi R, Griveau JC, Caciuffo R, Cornet SM, May I, Sharrad CA, Collison D, Winpenny REP. Superexchange coupling and slow magnetic relaxation in a transuranium polymetallic complex. Phys Rev Lett 2010; 104:197202. [PMID: 20866994 DOI: 10.1103/physrevlett.104.197202] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2010] [Indexed: 05/29/2023]
Abstract
{Np(VI)O2Cl2}{Np(V)O2Cl(thf)3}2 is the first studied example of a polymetallic transuranic complex displaying both slow relaxation of the magnetization and effective superexchange interactions between 5f centers. The coupling constant for Np(V)-Np(VI) pairs is 10.8 K, more than 1 order of magnitude larger than the common values found for rare-earth ions in similar environments. The dynamic magnetic behavior displays slow relaxation of magnetization of molecular origin with an energy barrier of 140 K, which is nearly twice the size of the highest barrier found in polymetallic clusters of the d block. Our observations also suggest that future actinide-based molecular magnets will have very different behavior to lanthanide-based clusters.
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Affiliation(s)
- N Magnani
- European Commission, Joint Research Centre, Institute for Transuranium Elements, Postfach 2340, D-76125 Karlsruhe, Germany
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Magnani N, Caciuffo R, Lander GH, Hiess A, Regnault LP. Polarized-neutron-scattering study of the spin-wave excitations in the 3-k ordered phase of uranium antimonide. J Phys Condens Matter 2010; 22:116002. [PMID: 21389477 DOI: 10.1088/0953-8984/22/11/116002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The anisotropy of magnetic fluctuations propagating along the [1 1 0] direction in the ordered phase of uranium antimonide has been studied using polarized inelastic neutron scattering. The observed polarization behavior of the spin waves is a natural consequence of the longitudinal 3-k magnetic structure; together with recent results on the 3-k-transverse uranium dioxide, these findings establish this technique as an important tool to study complex magnetic arrangements. Selected details of the magnon excitation spectra of USb have also been reinvestigated, indicating the need to revise the currently accepted theoretical picture for this material.
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Affiliation(s)
- N Magnani
- European Commission, Joint Research Centre, Institute for Transuranium Elements, Postfach 2340, D-76125 Karlsruhe, Germany
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42
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Caciuffo R, Wastin F, Treimany C, Guet C, Geeson D, Fanghänel T. Preface. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2009.9001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
| | | | | | | | | | - Thomas Fanghänel
- Europäische Komission, Institute for Transuranium Elements, Karlsruhe, Deutschland
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Bregiroux D, Popa K, Jardin R, Raison P, Wallez G, Quarton M, Brunelli M, Ferrero C, Caciuffo R. Crystal structure and thermal expansion of the low- and high-temperature forms of BaMIV(PO4)2 compounds (M=Ti, Zr, Hf and Sn). J SOLID STATE CHEM 2009. [DOI: 10.1016/j.jssc.2009.02.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Amoretti G, Caciuffo R, Carretta S, Guidi T, Magnani N, Santini P. Inelastic neutron scattering investigations of molecular nanomagnets. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2008.03.047] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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45
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Hiess A, Stunault A, Colineau E, Rebizant J, Wastin F, Caciuffo R, Lander GH. Electronic state of PuCoGa5 and NpCoGa5 as probed by polarized neutrons. Phys Rev Lett 2008; 100:076403. [PMID: 18352577 DOI: 10.1103/physrevlett.100.076403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2007] [Indexed: 05/26/2023]
Abstract
By using single crystals and polarized neutrons, we have measured the orbital and spin components of the microscopic magnetization in the paramagnetic state of NpCoGa(5) and PuCoGa(5). The microscopic magnetization of NpCoGa(5) agrees with that observed in bulk susceptibility measurements and the magnetic moment has spin and orbital contributions as expected for intermediate coupling. In contrast, for PuCoGa(5), which is a superconductor with a high transition temperature, the microscopic magnetization in the paramagnetic state is small, temperature-independent, and significantly below the value found with bulk techniques at low temperatures. The orbital moment dominates the magnetization.
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Affiliation(s)
- A Hiess
- Institut Laue-Langevin (ILL), Boîte Postale 156, F-38042 Grenoble, France
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46
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Carretta S, Santini P, Amoretti G, Guidi T, Copley JRD, Qiu Y, Caciuffo R, Timco G, Winpenny REP. Quantum oscillations of the total spin in a heterometallic antiferromagnetic ring: evidence from neutron spectroscopy. Phys Rev Lett 2007; 98:167401. [PMID: 17501458 DOI: 10.1103/physrevlett.98.167401] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Indexed: 05/15/2023]
Abstract
Using inelastic neutron scattering and applied fields up to 11.4 T, we have studied the spin dynamics of the Cr7Ni antiferromagnetic ring in the energy window 0.05-1.6 meV. We demonstrate that the external magnetic field induces an avoided crossing (anticrossing) between energy levels with different total-spin quantum numbers. This corresponds to quantum oscillations of the total spin of each molecule. The inelastic character of the observed excitation and the field dependence of its linewidth indicate that molecular spins oscillate coherently for a significant number of cycles. Precise signatures of the anticrossing are also found at higher energy, where measured and calculated spectra match very well.
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Affiliation(s)
- S Carretta
- Dipartimento di Fisica, Università di Parma, I-43100 Parma, Italy
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47
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Arduini A, Caciuffo R, Geremia S, Ferrero C, Ugozzoli F, Zontone F. Temperature Dependence of the Weak Host-guest Interactions in the p‐tertbutylcalix[4]Arene 1:1 Toluene Complex. Supramol Chem 2006. [DOI: 10.1080/10610279808055404] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- A. Arduini
- a Dipartimento di Chimica Organica e Industriale , Università di Parma , viale delle Scienze, 43100, Parma, Italy
| | - R. Caciuffo
- b Istituto Nazionale per la Fisica della Materia e, Università di Ancona, Dipartimento di Scienze dei Materiali e della Terra , Via Brecce Bianche, I-60131, Italy
| | - S. Geremia
- c Dipartimento di Scienze Chimiche , Università di Trieste , via L. Giorgieri 1, I-34127, Trieste, Italy
| | - C. Ferrero
- d European Syncrotron Radiation Facility, ESRF , B.P. 220, F 38043, Grenoble, Cedex, France
| | - F. Ugozzoli
- e Dipartimento di Chimica Generale ed Inorganica Chimica Analitica Chimica Fisica , Università di Parma and Centro di Studio per la Strutturistica Diffrattometrica del C.N.R. , viale delle Scienze, 1‐43100, Parma, Italy
| | - F. Zontone
- d European Syncrotron Radiation Facility, ESRF , B.P. 220, F 38043, Grenoble, Cedex, France
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48
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Santini P, Carretta S, Magnani N, Amoretti G, Caciuffo R. Hidden order and low-energy excitations in NpO2. Phys Rev Lett 2006; 97:207203. [PMID: 17155710 DOI: 10.1103/physrevlett.97.207203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2006] [Indexed: 05/12/2023]
Abstract
We investigate the nature of the hidden order parameter in the ordered phase of NpO2, which had been identified with a staggered arrangement of Gamma5 magnetic multipoles. By analyzing the existing experimental data, we show that the most likely driving order parameter is not provided by octupoles, as usually assumed, but rather by the rank-5 triakontadipoles. Calculations of the coupled dynamics of spins, Gamma5 quadrupoles, and Gamma5 triakontadipoles in the ordered phase enable us to analyze the resulting structure of low-energy excitations. We show that the powder inelastic neutron scattering cross section should contain, in addition to the already-observed peak at 6.5 meV, a second weaker peak at about 14 meV.
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Affiliation(s)
- P Santini
- Dipartimento di Fisica, Università di Parma, I-43100 Parma, Italy
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49
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Bombardi A, Rodriguez-Carvajal J, Di Matteo S, de Bergevin F, Paolasini L, Carretta P, Millet P, Caciuffo R. Direct determination of the magnetic ground state in the square lattice S = 1/2 antiferromagnet Li2VOSiO4. Phys Rev Lett 2004; 93:027202. [PMID: 15323947 DOI: 10.1103/physrevlett.93.027202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2003] [Indexed: 05/24/2023]
Abstract
Powder neutron diffraction and resonant x-ray scattering measurements from a single crystal have been performed to study the low-temperature state of the 2D frustrated, quantum-Heisenberg system Li2VOSiO4. Both techniques indicate a collinear antiferromagnetic ground state, with propagation vector k=(1 / 2 1 / 2 0), and magnetic moments in the a-b plane. Contrary to previous reports, the ordered moment at 1.44 K, m=0.63(3)micro(B), is very close to the value expected for the square lattice Heisenberg model ( approximately 0.6micro(B)). The magnetic order is three dimensional, with antiferromagnetic a-b layers stacked ferromagnetically along the c axis. Neither x-ray nor neutron diffraction shows evidence for a structural distortion between 1.6 and 10 K.
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Affiliation(s)
- A Bombardi
- European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
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50
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Waldmann O, Carretta S, Santini P, Koch R, Jansen AGM, Amoretti G, Caciuffo R, Zhao L, Thompson LK. Quantum magneto-oscillations in a supramolecular Mn(II)-[3 x 3] grid. Phys Rev Lett 2004; 92:096403. [PMID: 15089497 DOI: 10.1103/physrevlett.92.096403] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2003] [Indexed: 05/24/2023]
Abstract
The magnetic grid molecule Mn(II)-[3 x 3] has been studied by high-field torque magnetometry at 3He temperatures. At fields above 5 T, the torque versus field curves exhibit an unprecedented oscillatory behavior. A model is proposed which describes these magneto-oscillations well.
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Affiliation(s)
- O Waldmann
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
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