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Adler P, Jeglič P, Reehuis M, Geiß M, Merz P, Knaflič T, Komelj M, Hoser A, Sans A, Janek J, Arčon D, Jansen M, Felser C. Verwey-type charge ordering transition in an open-shell p-electron compound. SCIENCE ADVANCES 2018; 4:eaap7581. [PMID: 29372183 PMCID: PMC5775027 DOI: 10.1126/sciadv.aap7581] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Accepted: 12/11/2017] [Indexed: 06/07/2023]
Abstract
The Verwey transition in Fe3O4, a complex structural phase transition concomitant with a jump in electrical conductivity by two orders of magnitude, has been a benchmark for charge ordering (CO) phenomena in mixed-valence transition metal materials. CO is of central importance, because it frequently competes with functional properties such as superconductivity or metallic ferromagnetism. However, the CO state in Fe3O4 turned out to be complex, and the mechanism of the Verwey transition remains controversial. We demonstrate an archetypical Verwey-type transition in an open p-shell anionic mixed-valence compound using complementary diffraction and spectroscopic techniques. In Cs4O6, a phase change from a cubic structure with a single crystallographic site for the molecular O2x- building units to a tetragonal structure with ordered superoxide O2- and peroxide O22- entities is accompanied by a drastic drop in electronic conductivity and molecular charge fluctuation rates. The simple CO pattern of molecular units and the lack of magnetic order suggest Cs4O6 as a model system for disentangling the complex interplay of charge, lattice, orbital, and spin degrees of freedom in Verwey-type CO processes.
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Affiliation(s)
- Peter Adler
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Peter Jeglič
- Jožef Stefan Institute, Jamova c. 39, 1000 Ljubljana, Slovenia
| | - Manfred Reehuis
- Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany
| | - Matthias Geiß
- Institute of Physical Chemistry and Center for Materials Research, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Patrick Merz
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Tilen Knaflič
- Jožef Stefan Institute, Jamova c. 39, 1000 Ljubljana, Slovenia
| | - Matej Komelj
- Jožef Stefan Institute, Jamova c. 39, 1000 Ljubljana, Slovenia
| | - Andreas Hoser
- Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany
| | - Annette Sans
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Jürgen Janek
- Institute of Physical Chemistry and Center for Materials Research, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Denis Arčon
- Jožef Stefan Institute, Jamova c. 39, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, Jadranska c. 19, 1000 Ljubljana, Slovenia
| | - Martin Jansen
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Claudia Felser
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
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Takabayashi Y, Menelaou M, Tamura H, Takemori N, Koretsune T, Štefančič A, Klupp G, Buurma AJC, Nomura Y, Arita R, Arčon D, Rosseinsky MJ, Prassides K. π-electron S = ½ quantum spin-liquid state in an ionic polyaromatic hydrocarbon. Nat Chem 2017. [DOI: 10.1038/nchem.2764] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Merz P, Schmidt M, Felser C, Jansen M. Thermo-analytical Investigations on the Superoxides A
O2
(A
= K, Rb, Cs), Revealing Facile Access to Sesquioxides A4
O6. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Patrick Merz
- Max-Planck-Institut für Chemische Physik fester Stoffe; Nöthnitzer Str. 40 01187 Dresden Germany
| | - Marcus Schmidt
- Max-Planck-Institut für Chemische Physik fester Stoffe; Nöthnitzer Str. 40 01187 Dresden Germany
| | - Claudia Felser
- Max-Planck-Institut für Chemische Physik fester Stoffe; Nöthnitzer Str. 40 01187 Dresden Germany
| | - Martin Jansen
- Max-Planck-Institut für Chemische Physik fester Stoffe; Nöthnitzer Str. 40 01187 Dresden Germany
- Max-Planck-Institut für Festkörperforschung; Heisenbergstr.1 70569 Stuttgart Germany
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Jeong M, Schmidiger D, Mayaffre H, Klanjšek M, Berthier C, Knafo W, Ballon G, Vignolle B, Krämer S, Zheludev A, Horvatić M. Dichotomy between Attractive and Repulsive Tomonaga-Luttinger Liquids in Spin Ladders. PHYSICAL REVIEW LETTERS 2016; 117:106402. [PMID: 27636483 DOI: 10.1103/physrevlett.117.106402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Indexed: 06/06/2023]
Abstract
We present a direct NMR method to determine whether the interactions in a Tomonaga-Luttinger liquid (TLL) state of a spin-1/2 Heisenberg antiferromagnetic ladder are attractive or repulsive. For the strong-leg spin ladder compound (C_{7}H_{10}N)_{2}CuBr_{4} we find that the isothermal magnetic field dependence of the NMR relaxation rate T_{1}^{-1}(H) displays a concave curve between the two critical fields bounding the TLL regime. This is in sharp contrast to the convex curve previously reported for a strong-rung ladder, (C_{5}H_{12}N)_{2}CuBr_{4}. We show that the concavity and the convexity of T_{1}^{-1}(H), which is a fingerprint of spin fluctuations, directly reflect the attractive and repulsive fermionic interactions in the TLL, respectively. The interaction sign is alternatively determined from an indirect method combining bulk magnetization and specific heat data.
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Affiliation(s)
- M Jeong
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
- Laboratory for Quantum Magnetism, Institute of Physics, Ecole Polytechnique Féderale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - D Schmidiger
- Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH, 8093 Zürich, Switzerland
| | - H Mayaffre
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - M Klanjšek
- Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - C Berthier
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - W Knafo
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, 31400 Toulouse, France
| | - G Ballon
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, 31400 Toulouse, France
| | - B Vignolle
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, 31400 Toulouse, France
| | - S Krämer
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - A Zheludev
- Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH, 8093 Zürich, Switzerland
| | - M Horvatić
- Laboratoire National des Champs Magnétique Intenses, LNCMI-CNRS (UPR3228), UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
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