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26 April 2024

» arxiv » 1506.4018

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Identification of prototypical Brinkman-Rice Mott physics in a class of iron chalcogenides superconductors
X. H. Niu ; S. D. Chen ; J. Jiang ; Z. R. Ye ; T. L. Yu ; D. F. Xu ; M. Xu ; Y. Feng ; Y. J. Yan ; B. P. Xie ; J. Zhao ; D. C. Gu ; L.L. Sun ; Qianhui Mao ; Hangdong Wang ; Minghu Fang ; C. J. Zhang ; J. P. Hu ; Z. Sun ; D. L. Feng ;
Date:	12 Jun 2015
Abstract:	Using angle-resolved photoemission spectroscopy, we studied isovalently doped K$_{x}$Fe$_{2-y}$Se$_{2-z}$S$_{z}$, Rb$_{x}$Fe$_{2-y}$Se$_{2-z}$Te$_{z}$ and (Tl,K)$_{x}$Fe$_{2-y}$Se$_{2-z}$S$_{z}$, in which the superconducting transition temperature (T$_{c}$) decreases with either positive or negative chemical pressures. The bandwidth of Fe 3d bands in these materials changes systematically with doping: with the decreasing of bandwidth, the ground state evolves from a metal to a superconductor, and eventually to an insulator. We unambiguously show that these materials can be all fit into a prototypical phase diagram of bandwidth-controlled Mott system. Our results indicate that iron-based superconductors can be understood as a derivative of Mott insulator, and it might be unified with the cuprate high temperature superconductors in a single framework.
Source:	arXiv, 1506.4018
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