1
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Fijalkowski KM, Liu N, Mandal P, Schreyeck S, Brunner K, Gould C, Molenkamp LW. Macroscopic Quantum Tunneling of a Topological Ferromagnet. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023:e2303165. [PMID: 37314152 PMCID: PMC10401085 DOI: 10.1002/advs.202303165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Indexed: 06/15/2023]
Abstract
The recent advent of topological states of matter spawned many significant discoveries. The quantum anomalous Hall (QAH) effect is a prime example due to its potential for applications in quantum metrology, as well as its influence on fundamental research into the underlying topological and magnetic states and into axion electrodynamics. Here, electronic transport studies on a (V,Bi,Sb)2 Te3 ferromagnetic topological insulator nanostructure in the QAH regime are presented. This allows access to the dynamics of an individual ferromagnetic domain. The domain size is estimated to be in the 50-100 nm range. Telegraph noise resulting from the magnetization fluctuations of this domain is observed in the Hall signal. Careful analysis of the influence of temperature and external magnetic field on the domain switching statistics provides evidence for quantum tunneling (QT) of magnetization in a macrospin state. This ferromagnetic macrospin is not only the largest magnetic object in which QT is observed, but also the first observation of the effect in a topological state of matter.
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Affiliation(s)
- Kajetan M Fijalkowski
- Faculty for Physics and Astronomy (EP3), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
- Institute for Topological Insulators, Am Hubland, D-97074, Würzburg, Germany
| | - Nan Liu
- Faculty for Physics and Astronomy (EP3), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
- Institute for Topological Insulators, Am Hubland, D-97074, Würzburg, Germany
| | - Pankaj Mandal
- Faculty for Physics and Astronomy (EP3), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
- Institute for Topological Insulators, Am Hubland, D-97074, Würzburg, Germany
| | - Steffen Schreyeck
- Faculty for Physics and Astronomy (EP3), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
- Institute for Topological Insulators, Am Hubland, D-97074, Würzburg, Germany
| | - Karl Brunner
- Faculty for Physics and Astronomy (EP3), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
- Institute for Topological Insulators, Am Hubland, D-97074, Würzburg, Germany
| | - Charles Gould
- Faculty for Physics and Astronomy (EP3), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
- Institute for Topological Insulators, Am Hubland, D-97074, Würzburg, Germany
| | - Laurens W Molenkamp
- Faculty for Physics and Astronomy (EP3), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
- Institute for Topological Insulators, Am Hubland, D-97074, Würzburg, Germany
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2
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Moseley IP, Ard CP, DiVerdi JA, Ozarowski A, Chen H, Zadrozny JM. Slowing magnetic relaxation with open-shell diluents. CELL REPORTS. PHYSICAL SCIENCE 2022; 3:100802. [PMID: 35425929 PMCID: PMC9007552 DOI: 10.1016/j.xcrp.2022.100802] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Strategies for slowing magnetic relaxation via local environmental design are vital for developing next-generation spin-based technologies (e.g., quantum information processing). Herein, we demonstrate a technique to do so via chemical design of a local magnetic environment. We show that embedding the open-shell complex (Ph4P)2[Co(SPh)4] in solid-state matrices of the isostructural, open-shell species (Ph4P)2[M(SPh)4] (M = Ni2+, S = 1; M = Fe2+, S = 2; M = Mn2+, S = 5 2 ) will slow magnetic relaxation for the embedded [Co(SPh)4]2- ion by three orders of magnitude. Magnetometry, electron paramagnetic resonance (EPR), and computational analyses reveal that integer spin and large, positive zero-field splitting (D) values for the diluent produce a quiet, local magnetic field that slows relaxation rates for the embedded Co molecules. These results will enable the investigation of magnetic systems for which strictly diamagnetic congeners are either synthetically inaccessible or are not isostructural.
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Affiliation(s)
- Ian P. Moseley
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
| | - Christopher P. Ard
- Department of Physics, Colorado State University, Fort Collins, CO 80523, USA
| | - Joseph A. DiVerdi
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - Hua Chen
- Department of Physics, Colorado State University, Fort Collins, CO 80523, USA
- School of Advanced Materials Discovery, Colorado State University, Fort Collins, CO 80523, USA
| | - Joseph M. Zadrozny
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
- Lead contact
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3
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Nehrkorn J, Greer SM, Malbrecht BJ, Anderton KJ, Aliabadi A, Krzystek J, Schnegg A, Holldack K, Herrmann C, Betley TA, Stoll S, Hill S. Spectroscopic Investigation of a Metal-Metal-Bonded Fe 6 Single-Molecule Magnet with an Isolated S = 19/ 2 Giant-Spin Ground State. Inorg Chem 2021; 60:4610-4622. [PMID: 33683105 DOI: 10.1021/acs.inorgchem.0c03595] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The metal-metal-bonded molecule [Bu4N][(HL)2Fe6(dmf)2] (Fe6) was previously shown to possess a thermally isolated spin S = 19/2 ground state and found to exhibit slow magnetization relaxation below a blocking temperature of ∼5 K [J. Am. Chem. Soc. 2015, 137, 13949-13956]. Here, we present a comprehensive spectroscopic investigation of this unique single-molecule magnet (SMM), combining ultrawideband field-swept high-field electron paramagnetic resonance (EPR) with frequency-domain Fourier-transform terahertz EPR to accurately quantify the spin Hamiltonian parameters of Fe6. Of particular importance is the near absence of a 4th-order axial zero-field splitting term, which is known to arise because of quantum mechanical mixing of spin states on account of the relatively weak spin-spin (superexchange) interactions in traditional polynuclear SMMs such as the celebrated Mn12-acetate. The combined high-resolution measurements on both powder samples and an oriented single crystal provide a quantitative measure of the isolated nature of the spin ground state in the Fe6 molecule, as well as additional microscopic insights into factors that govern the quantum tunneling of its magnetization. This work suggests strategies for improving the performance of polynuclear SMMs featuring direct metal-metal bonds and strong ferromagnetic spin-spin (exchange) interactions.
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Affiliation(s)
- Joscha Nehrkorn
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States.,Department of Chemistry, Institute for Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.,Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, United States.,Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Samuel M Greer
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States.,Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Brian J Malbrecht
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Kevin J Anderton
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Azar Aliabadi
- Berlin Joint EPR Laboratory, Institut für Nanospektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße 5, Berlin 12489, Germany
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Alexander Schnegg
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany.,Berlin Joint EPR Laboratory, Institut für Nanospektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße 5, Berlin 12489, Germany
| | - Karsten Holldack
- Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Straße 15, Berlin 12489, Germany
| | - Carmen Herrmann
- Department of Chemistry, Institute for Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Theodore A Betley
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Stefan Stoll
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, United States
| | - Stephen Hill
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States.,Department of Physics, Florida State University, Tallahassee 32306, Florida, United States
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4
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Greer SM, Gramigna KM, Thomas CM, Stoian SA, Hill S. Insights into Molecular Magnetism in Metal-Metal Bonded Systems as Revealed by a Spectroscopic and Computational Analysis of Diiron Complexes. Inorg Chem 2020; 59:18141-18155. [PMID: 33253552 DOI: 10.1021/acs.inorgchem.0c02605] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A pair of bimetallic compounds featuring Fe-Fe bonds, [Fe(iPrNPPh2)3FeR] (R = PMe3, ≡NtBu), have been investigated using High-Frequency Electron Paramagnetic Resonance (HFEPR) as well as field- and temperature-dependent 57Fe nuclear γ resonance (Mössbauer) spectroscopy. To gain insight into the local site electronic structure, we have concurrently studied a compound containing a single Fe(II) in a geometry analogous to that of one of the dimer sites. Our spectroscopic studies have allowed for the assessment of the electronic structure via the determination of the zero-field splitting and 57Fe hyperfine parameters for the entire series. We also report on our efforts to correlate structure with physical properties in metal-metal bonded systems using ligand field theory guided by quantum chemical calculations. Through the insight gained in this study, we discuss strategies for the design of single-molecule magnets based on polymetallic compounds linked via direct metal-metal bonds.
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Affiliation(s)
- Samuel M Greer
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States.,Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Kathryn M Gramigna
- Department of Chemistry, Brandeis University, Waltham, Massachusetts 02453, United States
| | - Christine M Thomas
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Sebastian A Stoian
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - Stephen Hill
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States.,Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
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5
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Krylov DS, Liu F, Brandenburg A, Spree L, Bon V, Kaskel S, Wolter AUB, Büchner B, Avdoshenko SM, Popov AA. Magnetization relaxation in the single-ion magnet DySc 2N@C 80: quantum tunneling, magnetic dilution, and unconventional temperature dependence. Phys Chem Chem Phys 2018; 20:11656-11672. [PMID: 29671443 PMCID: PMC5933001 DOI: 10.1039/c8cp01608a] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quantum tunneling and relaxation of magnetization in single molecule magnet DySc2N@C80 is thoroughly studied as a function of magnetic dilution, temperature, and magnetic field.
Relaxation of magnetization in endohedral metallofullerenes DySc2N@C80 is studied at different temperatures, in different magnetic fields, and in different molecular arrangements. Magnetization behavior and relaxation are analyzed for powder sample, and for DySc2N@C80 diluted in non-magnetic fullerene Lu3N@C80, adsorbed in voids of a metal–organic framework, and dispersed in a polymer. The magnetic field dependence and zero-field relaxation are also studied for single-crystals of DySc2N@C80 co-crystallized with Ni(ii) octaethylporphyrin, as well as for the single crystal diluted with Lu3N@C80. Landau–Zener theory is applied to analyze quantum tunneling of magnetization in the crystals. The field dependence of relaxation rates revealed a dramatic dependence of the zero-field tunneling resonance width on the dilution and is explained with the help of an analysis of dipolar field distributions. AC magnetometry is used then to get access to the relaxation of magnetization in a broader temperature range, from 2 to 87 K. Finally, a theoretical framework describing the spin dynamics with dissipation is proposed to study magnetization relaxation phenomena in single molecule magnets.
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Affiliation(s)
- D S Krylov
- Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany.
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6
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Perfetti M. Cantilever torque magnetometry on coordination compounds: from theory to experiments. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.08.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Tabrizi SG, Arbuznikov AV, Kaupp M. Construction of Giant-Spin Hamiltonians from Many-Spin Hamiltonians by Third-Order Perturbation Theory and Application to an Fe3 Cr Single-Molecule Magnet. Chemistry 2016; 22:6853-62. [PMID: 27062248 DOI: 10.1002/chem.201504896] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Indexed: 11/10/2022]
Abstract
A general giant-spin Hamiltonian (GSH) describing an effective spin multiplet of an exchange-coupled metal cluster with dominant Heisenberg interactions was derived from a many-spin Hamiltonian (MSH) by treating anisotropic interactions at the third order of perturbation theory. Going beyond the existing second-order perturbation treatment allows irreducible tensor operators of rank six (or corresponding Stevens operator equivalents) in the GSH to be obtained. Such terms were found to be of crucial importance for the fitting of high-field EPR spectra of a number of single-molecule magnets (SMMs). Also, recent magnetization measurements on trigonal and tetragonal SMMs have found the inclusion of such high-rank axial and transverse terms to be necessary to account for experimental data in terms of giant-spin models. While mixing of spin multiplets by local zero-field splitting interactions was identified as the major origin of these contributions to the GSH, a direct and efficient microscopic explanation had been lacking. The third-order approach developed in this work is used to illustrate the mapping of an MSH onto a GSH for an S=6 trigonal Fe3 Cr complex that was recently investigated by high-field EPR spectroscopy. Comparisons between MSH and GSH consider the simulation of EPR data with both Hamiltonians, as well as locations of diabolical points (conical intersections) in magnetic-field space. The results question the ability of present high-field EPR techniques to determine high-rank zero-field splitting terms uniquely, and lead to a revision of the experimental GSH parameters of the Fe3 Cr SMM. Indeed, a bidirectional mapping between MSH and GSH effectively constrains the number of free parameters in the GSH. This notion may in the future facilitate spectral fitting for highly symmetric SMMs.
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Affiliation(s)
- Shadan Ghassemi Tabrizi
- Technische Universität Berlin, Institut für Chemie, Theoretische Chemie, Sekr. C7, Strasse des 17. Juni 135, 10623, Berlin, Germany.
| | - Alexei V Arbuznikov
- Technische Universität Berlin, Institut für Chemie, Theoretische Chemie, Sekr. C7, Strasse des 17. Juni 135, 10623, Berlin, Germany
| | - Martin Kaupp
- Technische Universität Berlin, Institut für Chemie, Theoretische Chemie, Sekr. C7, Strasse des 17. Juni 135, 10623, Berlin, Germany
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8
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Zhu YY, Zhang YQ, Yin TT, Gao C, Wang BW, Gao S. A Family of CoIICoIII3 Single-Ion Magnets with Zero-Field Slow Magnetic Relaxation: Fine Tuning of Energy Barrier by Remote Substituent and Counter Cation. Inorg Chem 2015; 54:5475-86. [DOI: 10.1021/acs.inorgchem.5b00526] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuan-Yuan Zhu
- School
of Chemistry and Chemical Engineering, Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, China
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yi-Quan Zhang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
- Jiangsu
Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China
| | - Ting-Ting Yin
- School
of Chemistry and Chemical Engineering, Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, China
| | - Chen Gao
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
| | - Bing-Wu Wang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
| | - Song Gao
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
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9
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Glaser T, Hoeke V, Gieb K, Schnack J, Schröder C, Müller P. Quantum tunneling of the magnetization in [MnIII6M]3+ (M=CrIII, MnIII) SMMs: Impact of molecular and crystal symmetry. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.12.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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10
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Rudowicz C, Karbowiak M. Disentangling intricate web of interrelated notions at the interface between the physical (crystal field) Hamiltonians and the effective (spin) Hamiltonians. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.12.006] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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11
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Nehrkorn J, Schnegg A, Holldack K, Stoll S. General magnetic transition dipole moments for electron paramagnetic resonance. PHYSICAL REVIEW LETTERS 2015; 114:010801. [PMID: 25615456 DOI: 10.1103/physrevlett.114.010801] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Indexed: 06/04/2023]
Abstract
We present general expressions for the magnetic transition rates in electron paramagnetic resonance (EPR) experiments of anisotropic spin systems in the solid state. The expressions apply to general spin centers and arbitrary excitation geometry (Voigt, Faraday, and intermediate). They work for linear and circular polarized as well as unpolarized excitation, and for crystals and powders. The expressions are based on the concept of the (complex) magnetic transition dipole moment vector. Using the new theory, we determine the parities of ground and excited spin states of high-spin (S=5/2) Fe(III) in hemin from the polarization dependence of experimental EPR line intensities.
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Affiliation(s)
- Joscha Nehrkorn
- Berlin Joint EPR Laboratory, Institut für Silizium-Photovoltaik, Helmholtz-Zentrum Berlin für Materialien und Energie, D-12489 Berlin, Germany
| | - Alexander Schnegg
- Berlin Joint EPR Laboratory, Institut für Silizium-Photovoltaik, Helmholtz-Zentrum Berlin für Materialien und Energie, D-12489 Berlin, Germany
| | - Karsten Holldack
- Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie, D-12489 Berlin, Germany
| | - Stefan Stoll
- Department of Chemistry, University of Washington, Seattle, Washington 98195, USA
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12
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The bridging azido ligand as a central “player” in high-nuclearity 3d-metal cluster chemistry. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.04.001] [Citation(s) in RCA: 143] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Atkinson JH, Inglis R, del Barco E, Brechin EK. Three-leaf quantum interference clovers in a trigonal single-molecule magnet. PHYSICAL REVIEW LETTERS 2014; 113:087201. [PMID: 25192120 DOI: 10.1103/physrevlett.113.087201] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Indexed: 06/03/2023]
Abstract
We report on a single-molecule magnet where the spatial arrangement of three manganese ions and their spin-orbit coupling tensor orientations result in threefold angular modulations of the magnetization tunneling rates and quantum interference patterns that mimic the form of a three-leaf clover. Although expected in all quantum tunneling of magnetization resonances for a trigonal molecular symmetry, the threefold modulation only appears at resonances for which a longitudinal magnetic field is applied (i.e., resonance numbers |k|>0). A sixfold transverse field modulation observed at resonance k = 0 manifests as a direct consequence of a threefold corrugation of the spin-orbit coupling energy landscape, creating an effective longitudinal field which varies the resonance condition in the presence of a transverse field. The observations allow for an association between the trigonal distortion of the local spin-orbit interactions and the spatial disposition of the constituent ions, a finding that can be extrapolated to other systems where spin-orbit coupling plays a significant role.
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Affiliation(s)
- James H Atkinson
- Department of Physics, University of Central Florida, Orlando, Florida 32765, USA
| | - Ross Inglis
- EaStCHEM School of Chemistry, The University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
| | - Enrique del Barco
- Department of Physics, University of Central Florida, Orlando, Florida 32765, USA
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
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14
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Zhu YY, Cui C, Qian K, Yin J, Wang BW, Wang ZM, Gao S. A family of enantiopure FeIII4 single molecule magnets: fine tuning of energy barrier by remote substituent. Dalton Trans 2014; 43:11897-907. [DOI: 10.1039/c3dt53317d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a new family of enantiopure star-shaped FeIII4 single-molecule magnets (SMMs). Interestingly, the SMM properties of this series of clusters can be finely tuned by the remote substituent of the ligands.
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Affiliation(s)
- Yuan-Yuan Zhu
- Key Laboratory of Advanced Functional Materials and Devices
- Anhui Province
- and School of Chemical Engineering
- Hefei University of Technology
- Hefei, P. R. China
| | - Chang Cui
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871, P. R. China
| | - Kang Qian
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871, P. R. China
| | - Ji Yin
- Key Laboratory of Advanced Functional Materials and Devices
- Anhui Province
- and School of Chemical Engineering
- Hefei University of Technology
- Hefei, P. R. China
| | - Bing-Wu Wang
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871, P. R. China
| | - Zhe-Ming Wang
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871, P. R. China
| | - Song Gao
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871, P. R. China
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15
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16
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del Barco E, Heroux K, Hendrickson D. Anomalous field sweep rate dependence of the tunnel relaxation in single-molecule magnet Mn4–Bet. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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18
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Zhu YY, Cui C, Zhang YQ, Jia JH, Guo X, Gao C, Qian K, Jiang SD, Wang BW, Wang ZM, Gao S. Zero-field slow magnetic relaxation from single Co(ii) ion: a transition metal single-molecule magnet with high anisotropy barrier. Chem Sci 2013. [DOI: 10.1039/c3sc21893g] [Citation(s) in RCA: 266] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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19
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Hoeke V, Heidemeier M, Krickemeyer E, Stammler A, Bögge H, Schnack J, Postnikov A, Glaser T. Environmental Influence on the Single-Molecule Magnet Behavior of [MnIII6CrIII]3+: Molecular Symmetry versus Solid-State Effects. Inorg Chem 2012; 51:10929-54. [DOI: 10.1021/ic301406j] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Veronika Hoeke
- Lehrstuhl für Anorganische Chemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstr. 25, D-33615 Bielefeld, Germany
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20
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Mossin S, Tran BL, Adhikari D, Pink M, Heinemann FW, Sutter J, Szilagyi RK, Meyer K, Mindiola DJ. A mononuclear Fe(III) single molecule magnet with a 3/2↔5/2 spin crossover. J Am Chem Soc 2012; 134:13651-61. [PMID: 22817325 PMCID: PMC3495239 DOI: 10.1021/ja302660k] [Citation(s) in RCA: 236] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The air stable complex [(PNP)FeCl(2)] (1) (PNP = N[2-P(CHMe(2))(2)-4-methylphenyl](2)(-)), prepared from one-electron oxidation of [(PNP)FeCl] with ClCPh(3), displays an unexpected S = 3/2 to S = 5/2 transition above 80 K as inferred by the dc SQUID magnetic susceptibility measurement. The ac SQUID magnetization data, at zero field and between frequencies 10 and 1042 Hz, clearly reveal complex 1 to have frequency dependence on the out-of-phase signal and thus being a single molecular magnet with a thermally activated barrier of U(eff) = 32-36 cm(-1) (47-52 K). Variable-temperature Mössbauer data also corroborate a significant temperature dependence in δ and ΔE(Q) values for 1, which is in agreement with the system undergoing a change in spin state. Likewise, variable-temperature X-band EPR spectra of 1 reveals the S = 3/2 to be likely the ground state with the S = 5/2 being close in energy. Multiedge XAS absorption spectra suggest the electronic structure of 1 to be highly covalent with an effective iron oxidation state that is more reduced than the typical ferric complexes due to the significant interaction of the phosphine groups in PNP and Cl ligands with iron. A variable-temperature single crystal X-ray diffraction study of 1 collected between 30 and 300 K also reveals elongation of the Fe-P bond lengths and increment in the Cl-Fe-Cl angle as the S = 5/2 state is populated. Theoretical studies show overall similar orbital pictures except for the d(z(2)) orbital, which has the most sensitivity to change in the geometry and bonding, where the quartet ((4)B) and the sextet ((6)A) states are close in energy.
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Affiliation(s)
- Susanne Mossin
- Centre for Catalysis and Sustainable Chemistry, Technical University of Denmark, 2800 Lyngby, Denmark
| | - Ba L. Tran
- Department of Chemistry and the Molecular Structure Center, Indiana University, Bloomington, IN USA 47405
| | - Debashis Adhikari
- Department of Chemistry and the Molecular Structure Center, Indiana University, Bloomington, IN USA 47405
| | - Maren Pink
- Department of Chemistry and the Molecular Structure Center, Indiana University, Bloomington, IN USA 47405
| | - Frank W. Heinemann
- Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nuremburg, Erlangen, Germany 91058
| | - Jörg Sutter
- Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nuremburg, Erlangen, Germany 91058
| | - Robert K. Szilagyi
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana USA 59717
| | - Karsten Meyer
- Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nuremburg, Erlangen, Germany 91058
| | - Daniel J. Mindiola
- Department of Chemistry and the Molecular Structure Center, Indiana University, Bloomington, IN USA 47405
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Liu Y, Chen Z, Ren J, Zhao XQ, Cheng P, Zhao B. Two-dimensional 3d-4f networks containing planar Co4Ln2 clusters with single-molecule-magnet behaviors. Inorg Chem 2012; 51:7433-5. [PMID: 22734861 DOI: 10.1021/ic300372v] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Two novel two-dimensional 3d-4f networks based on planar Co(4)Ln(2) clusters supported by rigid 4'-(4-carboxyphenyl)-2,2':6',2"-terpyridine afford the first examples of high-dimensional networks with 3d-4f clusters behaving as single-molecule magnets.
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Affiliation(s)
- Yue Liu
- Key Laboratory of Advanced Energy Material Chemistry, MOE, Department of Chemistry, Nankai University, Tianjin 300071, China
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22
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Vergnani L, Barra AL, Neugebauer P, Rodriguez-Douton MJ, Sessoli R, Sorace L, Wernsdorfer W, Cornia A. Magnetic Bistability of Isolated Giant-Spin Centers in a Diamagnetic Crystalline Matrix. Chemistry 2012; 18:3390-8. [DOI: 10.1002/chem.201103251] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Indexed: 11/09/2022]
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23
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Hoeke V, Heidemeier M, Krickemeyer E, Stammler A, Bögge H, Schnack J, Glaser T. Structural influences on the exchange coupling and zero-field splitting in the single-molecule magnet [MnIII6MnIII]3+. Dalton Trans 2012; 41:12942-59. [DOI: 10.1039/c2dt31590d] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Quddusi HM, Liu J, Singh S, Heroux KJ, del Barco E, Hill S, Hendrickson DN. Asymmetric Berry-phase interference patterns in a single-molecule magnet. PHYSICAL REVIEW LETTERS 2011; 106:227201. [PMID: 21702626 DOI: 10.1103/physrevlett.106.227201] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Indexed: 05/31/2023]
Abstract
A Mn(4) single-molecule magnet displays asymmetric Berry-phase interference patterns in the transverse-field (H(T)) dependence of the magnetization tunneling probability when a longitudinal field (H(L)) is present, contrary to symmetric patterns observed for H(L)=0. Reversal of H(L) results in a reflection of the transverse-field asymmetry about H(T)=0, as expected on the basis of the time-reversal invariance of the spin-orbit Hamiltonian which is responsible for the tunneling oscillations. A fascinating motion of Berry-phase minima within the transverse-field magnitude-direction phase space results from a competition between noncollinear magnetoanisotropy tensors at the two distinct Mn sites.
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Affiliation(s)
- H M Quddusi
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
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25
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Dreiser J, Schnegg A, Holldack K, Pedersen KS, Schau-Magnussen M, Nehrkorn J, Tregenna-Piggott P, Mutka H, Weihe H, Bendix J, Waldmann O. Frequency-Domain Fourier-Transform Terahertz Spectroscopy of the Single-Molecule Magnet (NEt4)[Mn2(5-Brsalen)2(MeOH)2Cr(CN)6]. Chemistry 2011; 17:7492-8. [DOI: 10.1002/chem.201100581] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Indexed: 11/08/2022]
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26
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Li M, Lan Y, Ako AM, Wernsdorfer W, Anson CE, Buth G, Powell AK, Wang Z, Gao S. A Family of 3d-4f Octa-Nuclear [MnIII4LnIII4] Wheels (Ln = Sm, Gd, Tb, Dy, Ho, Er, and Y): Synthesis, Structure, and Magnetism. Inorg Chem 2010; 49:11587-94. [DOI: 10.1021/ic101754g] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mengyuan Li
- Institut für Anorganische Chemie der Universität Karlsruhe, Karlsruhe Institute of Technology, Engesserstrasse 15, D-76131 Karlsruhe, Germany
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yanhua Lan
- Institut für Anorganische Chemie der Universität Karlsruhe, Karlsruhe Institute of Technology, Engesserstrasse 15, D-76131 Karlsruhe, Germany
| | - Ayuk M. Ako
- Institut für Anorganische Chemie der Universität Karlsruhe, Karlsruhe Institute of Technology, Engesserstrasse 15, D-76131 Karlsruhe, Germany
- Institute for Nanotechnology, Forschungszentrum Karlsruhe, Karlsruhe Institute of Technology, Postfach 3640, D-76021 Karlsruhe, Germany
| | | | - Christopher E. Anson
- Institut für Anorganische Chemie der Universität Karlsruhe, Karlsruhe Institute of Technology, Engesserstrasse 15, D-76131 Karlsruhe, Germany
| | - Gernot Buth
- Institut für Synchrotron Strahlung (ISS), FZK, Karlsruhe Institute of Technology, Postfach 3640, D-76021 Karlsruhe, Germany
| | - Annie K. Powell
- Institut für Anorganische Chemie der Universität Karlsruhe, Karlsruhe Institute of Technology, Engesserstrasse 15, D-76131 Karlsruhe, Germany
- Institute for Nanotechnology, Forschungszentrum Karlsruhe, Karlsruhe Institute of Technology, Postfach 3640, D-76021 Karlsruhe, Germany
| | - Zheming Wang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Song Gao
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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27
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Feng PL, Stephenson CJ, Amjad A, Ogawa G, del Barco E, Hendrickson DN. Large Spin-State Changes in Isostructural Cyanate- and Azide-Bridged Mn3IIIMn2II Single-Molecule Magnets. Inorg Chem 2010; 49:1304-6. [DOI: 10.1021/ic902298y] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Patrick L. Feng
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358
| | - Casey J. Stephenson
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358
| | - Asma Amjad
- Department of Physics, University of Central Florida, Orlando, Florida 32816-2385
| | - Gavin Ogawa
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358
| | - Enrique del Barco
- Department of Physics, University of Central Florida, Orlando, Florida 32816-2385
| | - David N. Hendrickson
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358
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28
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Hill S, Datta S, Liu J, Inglis R, Milios CJ, Feng PL, Henderson JJ, del Barco E, Brechin EK, Hendrickson DN. Magnetic quantum tunneling: insights from simple molecule-based magnets. Dalton Trans 2010; 39:4693-707. [DOI: 10.1039/c002750b] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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