Ultrafast Quasiparticle Dynamics and Electron-Phonon Coupling in (Li0.84Fe0.16)OHFe0.98Se

被引：48

作者：

Wu, Qiong ^{[1
,2
]}

Zhou, Huaxue ^{[1
]}

Wu, Yanling ^{[1
]}

Hu, Lili ^{[1
]}

Ni, Shunli ^{[1
,2
]}

Tian, Yichao ^{[1
]}

Sun, Fei ^{[1
,2
]}

Zhou, Fang ^{[1
,2
,3
]}

Dong, Xiaoli ^{[1
,2
,3
]}

Zhao, Zhongxian ^{[1
,2
,3
]}

Zhao, Jimin ^{[1
,2
,3
]}

机构：

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

[2] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China

[3] Songshan Lake Mat Lab, Dongguan 523808, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2020年 / 37卷 / 09期

基金：

北京市自然科学基金; 中国国家自然科学基金;

关键词：

78; 47; J-; jg; 71; 38; -k; 74; 70; -b; TRANSITION-TEMPERATURE; IRON SELENIDE; SUPERCONDUCTIVITY; 1ST-PRINCIPLES;

D O I：

10.1088/0256-307X/37/9/097802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Distinctive superconducting behaviors between bulk and monolayer FeSe make it challenging to obtain a unified picture of all FeSe-based superconductors. We investigate the ultrafast quasiparticle (QP) dynamics of an intercalated superconductor (Li<INF>1 -x</INF>Fe<INF>x</INF>)OHFe<INF>1 -y</INF>Se, which is a bulk crystal but shares a similar electronic structure with single-layer FeSe on SrTiO<INF>3</INF>. We obtain the electron-phonon coupling (EPC) constant lambda<INF>A<INF>1g</INF></INF>(0.22 +/- 0.04), which well bridges that of bulk FeSe crystal and single-layer FeSe on SrTiO<INF>3</INF>. Significantly, we find that such a positive correlation between lambda<INF>A<INF>1g</INF></INF>and superconductingT<INF>c</INF>holds among all known FeSe-based superconductors, even in line with reported FeAs-based superconductors. Our observation indicates possible universal role of EPC in the superconductivity of all known categories of iron-based superconductors, which is a critical step towards achieving a unified superconducting mechanism for all iron-based superconductors.

引用

页数：7

共 56 条

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