Author:
Xu Weiming,Dong Weiwei,Layek Samar,Shulman Mark,Glazyrin Konstantin,Bykova Elena,Bykov Maxim,Hanfland Michael,Pasternak Moshe P.,Leonov Ivan,Greenberg Eran,Rozenberg Gregory Kh.
Abstract
AbstractThe pressure-induced Mott insulator-to-metal transitions are often accompanied by a collapse of magnetic interactions associated with delocalization of 3d electrons and high-spin to low-spin (HS-LS) state transition. Here, we address a long-standing controversy regarding the high-pressure behavior of an archetypal Mott insulator FeBO3 and show the insufficiency of a standard theoretical approach assuming a conventional HS-LS transition for the description of the electronic properties of the Mott insulators at high pressures. Using high-resolution x-ray diffraction measurements supplemented by Mössbauer spectroscopy up to pressures ~ 150 GPa, we document an unusual electronic state characterized by a “mixed” HS/LS state with a stable abundance ratio realized in the $$R\overline{3 }c$$
R
3
¯
c
crystal structure with a single Fe site within a wide pressure range of ~ 50–106 GPa. Our results imply an unconventional cooperative (and probably dynamical) nature of the ordering of the HS/LS Fe sites randomly distributed over the lattice, resulting in frustration of magnetic moments.
Funder
Israeli Science Foundation
Deutsches Elektronen-Synchrotron (DESY)
Publisher
Springer Science and Business Media LLC
Reference44 articles.
1. Mott, N. F. Metal-Insulator Transitions (Taylor & Francis, 1990).
2. Imada, M., Fujimori, A. & Tokura, Y. Metal-insulator transitions. Rev. Mod. Phys. 70, 1039–1263 (1998).
3. Si, Q. & Abrahams, E. Strong correlations and magnetic frustration in the high Tc iron pnictides. Phys. Rev. Lett. 101, 076401–076404 (2008).
4. de’Medici, L., Gianluca, G., Capone, M.,. Selective Mott Physics as a Key to Iron Superconductors. Phys. Rev. Lett. 112, 7001–7005 (2014).
5. Mott, N. F. In The metallic and nonmetallic states of matter (Edwards and Rao editors, chapter 1, 1985).
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献