Evolution from incoherent to coherent electronic states and its implications for superconductivity in FeTe1-x Sex

E. Ieki, K. Nakayama, Y. Miyata, T. Sato, H. Miao, N. Xu, X. P. Wang, P. Zhang, T. Qian, P. Richard, Z. J. Xu, J. S. Wen, G. D. Gu, H. Q. Luo, H. H. Wen, H. Ding, T. Takahashi

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We have performed systematic angle-resolved photoemission spectroscopy (ARPES) of iron-chalcogenide superconductor FeTe1-xSex (0≤x≤0.45) to elucidate the electronic states relevant to the superconductivity. While the Fermi-surface shape is nearly independent of x, we found that the ARPES spectral line shape shows prominent x dependence. A broad ARPES spectrum characterized by a small quasiparticle weight at x=0, indicative of incoherent electronic states, becomes progressively sharper with increasing x, and a well-defined quasiparticle peak appears around x=0.45 where bulk superconductivity is realized. The present result suggests the evolution from incoherent to coherent electronic states and its close relationship to the emergence of superconductivity.

Original languageEnglish
Article number140506
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number14
DOIs
Publication statusPublished - 2014 Apr 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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