TY - JOUR
T1 - The Mott insulators at extreme conditions; Structural consequences of pressure-induced electronic transitions
AU - Rozenberg, Gregory Kh
AU - Xu, Weiming
AU - Pasternak, Moshe P.
N1 - Funding Information:
Kertser, R. Arielly for assisting with the synchrotron experiments and for performing the resistivity measurements. We thank Drs M. Hanfland, T. Le Bihan, S. Carl-son, G. Garbarino, S. Pascarelli, M. Munoz, and M. Vaccari for experimental assistance with the facilities of the ID09, ID30, ID27 and ID24 beam lines at ESRF. This work was supported in part by Israeli Science Foundation Grant #789/10.
PY - 2014/3
Y1 - 2014/3
N2 - 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.
AB - 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.
KW - Electronic transitions
KW - High pressure
KW - Mott insulators
KW - X-ray crystallography
UR - http://www.scopus.com/inward/record.url?scp=84898660858&partnerID=8YFLogxK
U2 - 10.1515/zkri-2013-1644
DO - 10.1515/zkri-2013-1644
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AN - SCOPUS:84898660858
SN - 0044-2968
VL - 229
SP - 210
EP - 222
JO - Zeitschfrift fur Kristallographie
JF - Zeitschfrift fur Kristallographie
IS - 3
ER -