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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Huppertz, Hubert / Petrícek, Václav / Tiekink, E. R. T.

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Online
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2196-7105
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Volume 229, Issue 3 (Mar 2014)

Issues

The Mott insulators at extreme conditions; structural consequences of pressure-induced electronic transitions

Gregory Kh. Rozenberg
  • Corresponding author
  • School of Physics and Astronomy, Tel-Aviv University, Ramat-Aviv 69978, Tel Aviv, Israel
  • Email:
/ Weiming Xu
  • School of Physics and Astronomy, Tel-Aviv University, Ramat-Aviv 69978, Tel Aviv, Israel
/ Moshe P. Pasternak
  • School of Physics and Astronomy, Tel-Aviv University, Ramat-Aviv 69978, Tel Aviv, Israel
Published Online: 2014-01-09 | DOI: https://doi.org/10.1515/zkri-2013-1644

Abstract

Electronic/magnetic transitions and their structural consequences in Fe-based Mott insulators in a regime of very high static density are the main issue of this short review paper. The paper focuses on the above-mentioned topics based primarily on our previous and ongoing experimental HP studies employing: (i) diamond anvil cells, (ii) synchrotron X-ray diffraction, (iii) 57Fe Mössbauer spectroscopy, (iv) electrical resistance and (v) X-ray absorption spectroscopy. It is shown that applying pressure to such strongly correlated systems leads to a number of changes; including quenching of the orbital moment, quenching of Jahn-Teller distortion, spin crossover, inter-valence charge transfer, insulator–metal transition, moment collapse and volume collapse. These changes may occur simultaneously or sequentially over a range of pressures. Any of these may be accompanied by or be a consequence of a structural phase transition; namely, a change in crystal symmetry. Analyzing this rich variety of phenomena we show the main scenarios which such strongly correlated systems may undergo on the way to a correlation breakdown (Mott transition). To illustrate these scenarios we present recent results for MFeO3 (M = Fe, Ga, Lu, Eu, Pr) and CaFe2O4 ferric oxides; FeCl2 and FeI2 ferrous halides, and FeCr2S4 sulfide. Fe3O4 is given as an example case for the impact of Mössbauer Spectroscopy on High Pressure Crystallography studies.

Keywords: High pressure; Mott insulators; X-ray crystallography; Electronic transitions

About the article

Received: 2013-04-12

Accepted: 2013-10-29

Published Online: 2014-01-09

Published in Print: 2014-03-01


Citation Information: Zeitschrift für Kristallographie – Crystalline Materials, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1515/zkri-2013-1644. Export Citation

© 2014 by Walter de Gruyter Berlin Boston. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY-NC-ND 4.0)

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