Observation of temperature-induced crossover to an orbital-selective mott phase in AxFe2-ySe2 (A=K, Rb) superconductors

M. Yi, D. H. Lu, R. Yu, S. C. Riggs, J. H. Chu, B. Lv, Z. K. Liu, M. Lu, Y. T. Cui, M. Hashimoto, S. K. Mo, Z. Hussain, C. W. Chu, I. R. Fisher, Q. Si, Z. X. Shen

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181 引文 斯高帕斯(Scopus)

摘要

Using angle-resolved photoemission spectroscopy, we observe the low-temperature state of the AxFe2-ySe2 (A=K, Rb) superconductors to exhibit an orbital-dependent renormalization of the bands near the Fermi level - the dxy bands heavily renormalized compared to the dxz/dyz bands. Upon raising the temperature to above 150 K, the system evolves into a state in which the dxy bands have depleted spectral weight while the dxz/dyz bands remain metallic. Combined with theoretical calculations, our observations can be consistently understood as a temperature-induced crossover from a metallic state at low temperatures to an orbital-selective Mott phase at high temperatures. Moreover, the fact that the superconducting state of A xFe2-ySe2 is near the boundary of such an orbital-selective Mott phase constrains the system to have sufficiently strong on-site Coulomb interactions and Hund's coupling, highlighting the nontrivial role of electron correlation in this family of iron-based superconductors.

原文English
文章編號067003
期刊Physical review letters
110
發行號6
DOIs
出版狀態Published - 2013 2月 5

All Science Journal Classification (ASJC) codes

  • 物理與天文學 (全部)

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