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

被引：37

作者：

Ieki, E. ^{[1
]}

Nakayama, K. ^{[1
]}

Miyata, Y. ^{[1
]}

Sato, T. ^{[1
]}

Miao, H. ^{[2
,3
]}

Xu, N. ^{[2
,3
]}

Wang, X. -P. ^{[2
,3
]}

Zhang, P. ^{[2
,3
]}

Qian, T. ^{[2
,3
]}

Richard, P. ^{[2
,3
,4
]}

Xu, Z. -J. ^{[5
]}

Wen, J. S. ^{[5
]}

Gu, G. D. ^{[5
]}

Luo, H. Q. ^{[2
,3
]}

Wen, H. -H. ^{[6
]}

Ding, H. ^{[2
,3
,4
]}

Takahashi, T. ^{[1
,7
]}

机构：

[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[2] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[4] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China

[5] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[6] Nanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Ctr Superconducting Phys & Mat, Nanjing 210093, Jiangsu, Peoples R China

[7] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 14期

基金：

日本学术振兴会; 美国国家科学基金会;

关键词：

FESE;

D O I：

10.1103/PhysRevB.89.140506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed systematic angle-resolved photoemission spectroscopy (ARPES) of iron-chalcogenide superconductor FeTe1-x Se-x (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.

引用

页数：5

共 39 条

[1] Electronic structure of the iron chalcogenide KFeAgTe2 revealed by angle-resolved photoemission spectroscopy [J].