Mott behavior in KxFe2-ySe2 superconductors studied by pump-probe spectroscopy

被引：23

作者：

Li, Wei ^{[1
,2
]}

Zhang, Chunfeng ^{[1
,2
]}

Liu, Shenghua ^{[1
,2
]}

Ding, Xiaxin ^{[1
,2
]}

Wu, Xuewei ^{[1
,2
]}

Wang, Xiaoyong ^{[1
,2
]}

Wen, Hai-Hu ^{[1
,2
]}

Xiao, Min ^{[1
,2
,3
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China

[3] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 13期

基金：

美国国家科学基金会;

关键词：

IRON PNICTIDES; PHASE-SEPARATION; T-C; INSULATOR; GAP; DYNAMICS; ORDER;

D O I：

10.1103/PhysRevB.89.134515

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on a signature indicating a transition to the orbital-selective Mott phase in superconducting KxFe2-ySe2 single crystals by employing dual-color pump-probe spectroscopy. In addition to the multiexponential-decay recovery dynamics of photoinduced quasiparticles, a damped oscillatory component caused by coherent acoustic phonons emerges when the superconducting phase is suppressed at an increased temperature or excitation power. Upon raising the temperature to 150-170 K, the oscillatory component diminishes alongside a significant enhancement of the slow decay component in the recovery traces. These results can be understood as a gap opening in certain k directions, indicating that a vital role is played by electron correlation in iron-based superconductors.

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