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Pruessmann T, Nagel P, Simonelli L, Batchelor D, Gordon R, Schimmelpfennig B, Trumm M, Vitova T. Opportunities and challenges of applying advanced X-ray spectroscopy to actinide and lanthanide N-donor ligand systems. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:53-66. [PMID: 34985423 PMCID: PMC8733980 DOI: 10.1107/s1600577521012091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 11/12/2021] [Indexed: 06/14/2023]
Abstract
N-donor ligands such as n-Pr-BTP [2,6-bis(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine] preferentially bind trivalent actinides (An3+) over trivalent lanthanides (Ln3+) in liquid-liquid separation. However, the chemical and physical processes responsible for this selectivity are not yet well understood. Here, an explorative comparative X-ray spectroscopy and computational (L3-edge) study for the An/Ln L3-edge and the N K-edge of [An/Ln(n-Pr-BTP)3](NO3)3, [Ln(n-Pr-BTP)3](CF3SO3)3 and [Ln(n-Pr-BTP)3](ClO4)3 complexes is presented. High-resolution X-ray absorption near-edge structure (HR-XANES) L3-edge data reveal additional features in the pre- and post-edge range of the spectra that are investigated using the quantum chemical codes FEFF and FDMNES. X-ray Raman spectroscopy studies demonstrate the applicability of this novel technique for investigations of liquid samples of partitioning systems at the N K-edge.
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Affiliation(s)
- Tim Pruessmann
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Peter Nagel
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Laura Simonelli
- ALBA Synchrotron Light Facility, Cerdanyola del Vallès 08290, Spain
| | - David Batchelor
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Robert Gordon
- PNCSRF, APS Sector 20, Argonne, IL 60439, USA
- Moyie Institute, Burnaby, BC, Canada
| | - Bernd Schimmelpfennig
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Michael Trumm
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Tonya Vitova
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Maurya A, Kulkarni R, Dhar SK, Thamizhavel A. Anisotropic magnetic properties and crystal electric field studies on CePd2Ge2 single crystal. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:435603. [PMID: 24097258 DOI: 10.1088/0953-8984/25/43/435603] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The anisotropic magnetic properties of the antiferromagnetic compound CePd2Ge2, crystallizing in the tetragonal crystal structure have been investigated in detail on a single crystal grown by the Czochralski method. From the electrical transport, magnetization and heat capacity data, the Néel temperature is confirmed to be 5.1 K. Anisotropic behaviour of the magnetization and resistivity is observed along the two principal crystallographic directions-namely, [100] and [001]. The isothermal magnetization measured in the magnetically ordered state at 2 K exhibits a spin reorientation at 13.5 T for the field applied along the [100] direction, whereas the magnetization is linear along the [001] direction attaining a value of 0.94 μ(B)/Ce at 14 T. The reduced value of the magnetization is attributed to the crystalline electric field (CEF) effects. A sharp jump in the specific heat at the magnetic ordering temperature is observed. After subtracting the phononic contribution, the jump in the heat capacity amounts to 12.5 J K(-1)mol(-1) which is the expected value for a spin ½ system. From the CEF analysis of the magnetization data the excited crystal field split energy levels were estimated to be at 120 K and 230 K respectively, which quantitatively explains the observed Schottky anomaly in the heat capacity. A magnetic phase diagram has been constructed based on the field dependence of magnetic susceptibility and the heat capacity data.
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Affiliation(s)
- Arvind Maurya
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
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Matsumoto M, Han MJ, Otsuki J, Savrasov SY. First-principles simulations of heavy fermion cerium compounds based on the Kondo lattice. PHYSICAL REVIEW LETTERS 2009; 103:096403. [PMID: 19792815 DOI: 10.1103/physrevlett.103.096403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2009] [Indexed: 05/28/2023]
Abstract
We propose a new framework for first-principles calculations of heavy-fermion materials. These are described in terms of the Kondo lattice Hamiltonian with the parameters extracted from a realistic density functional based calculation which is then solved using continuous-time quantum Monte Carlo method and dynamical mean field theory. As an example, we show our results for the Néel temperatures of cerium-122 compounds (CeX(2)Si(2) with X = Ru, Rh, Pd, Cu, Ag, and Au) where the general trend around the magnetic quantum critical point is successfully reproduced. Our results are organized on a universal Doniach phase diagram in a semiquantitative way.
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Affiliation(s)
- Munehisa Matsumoto
- Department of Physics, University of California, Davis, California 95616, USA
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Hansmann P, Severing A, Hu Z, Haverkort MW, Chang CF, Klein S, Tanaka A, Hsieh HH, Lin HJ, Chen CT, Fåk B, Lejay P, Tjeng LH. Determining the crystal-field ground state in rare earth heavy fermion materials using soft-x-ray absorption spectroscopy. PHYSICAL REVIEW LETTERS 2008; 100:066405. [PMID: 18352496 DOI: 10.1103/physrevlett.100.066405] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2007] [Indexed: 05/26/2023]
Abstract
We infer that soft-x-ray absorption spectroscopy is a versatile method for the determination of the crystal-field ground state symmetry of rare earth heavy fermion systems, complementing neutron scattering. Using realistic and universal parameters, we provide a theoretical mapping between the polarization dependence of Ce M(4,5) spectra and the charge distribution of the Ce 4f states. The experimental resolution can be orders of magnitude larger than the 4f crystal-field splitting itself. To demonstrate the experimental feasibility of the method, we investigated CePd2Si2, thereby settling an existing disagreement about its crystal-field ground state.
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Affiliation(s)
- P Hansmann
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
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Chapter 130 Neutron inelastic scattering from actinides and anomalous lanthanides. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/s0168-1273(05)80059-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Goremychkin EA, Osborn R. Crystal-field excitations in CeCu2Si2. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:14280-14290. [PMID: 10005773 DOI: 10.1103/physrevb.47.14280] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Loidl A, Knorr K, Knopp G, Krimmel A, Caspary R, Böhm A, Sparn G, Geibel C, Steglich F, Murani AP. Neutron-scattering studies on CeM2Ge2(M=Ag, Au, and Ru). PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:9341-9351. [PMID: 10002738 DOI: 10.1103/physrevb.46.9341] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Garde CS, Ray J, Chandra G. Resistivity and thermopower studies in Ce(Ru1-xCux)2Si2 systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:7217-7221. [PMID: 10000493 DOI: 10.1103/physrevb.45.7217] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Szytuła A. Chapter 2 Magnetic properties of ternary intermetallic rare-earth compounds. HANDBOOK OF MAGNETIC MATERIALS 1991. [DOI: 10.1016/s1567-2719(05)80056-3] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Lacerda A, Haen P, Lejay P, Flouquet J. Thermal properties of heavy-fermion CeRu2Si2. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:8759-8768. [PMID: 9991353 DOI: 10.1103/physrevb.40.8759] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Severing A, Holland-Moritz E, Frick B. Spin dynamics of CeX2Si2 (X=Au, Pd, Rh, Ru). PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:4164-4174. [PMID: 9948751 DOI: 10.1103/physrevb.39.4164] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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