Pressure Evolution of Ultrafast Photocarrier Dynamics and Electron-Phonon Coupling in FeTe0.5Se0.5

被引：0

作者：

Li, Muyun ^{[1
,2
]}

Zhou, Yan ^{[1
]}

Zhang, Kai ^{[3
]}

Xu, Guangyong ^{[4
]}

Gu, Genda ^{[5
]}

Su, Fuhai ^{[3
]}

Chen, Xiaojia ^{[1
,6
]}

机构：

[1] Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China

[2] Shanghai Insit Space Power Source, Shanghai 200245, Peoples R China

[3] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, HFIPS, Hefei 230031, Peoples R China

[4] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

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

[6] Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China

来源：

MATERIALS | 2022年 / 15卷 / 23期

基金：

国家重点研发计划;

关键词：

iron chalcogenides; phonons; Raman scattering; femtosecond; CHALCOGENIDE GLASSES; SUPERCONDUCTIVITY; FIBERS; FILMS; SE;

D O I：

10.3390/ma15238467

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Understanding the coupling between electrons and phonons in iron chalcogenides FeTexSe1-x has remained a critical but arduous project in recent decades. The direct observation of the electron-phonon coupling effect through electron dynamics and vibrational properties has been lacking. Here, we report the first pressure-dependent ultrafast photocarrier dynamics and Raman scattering studies on an iron chalcogenide FeTe0.5Se0.5 to explore the interaction between electrons and phonons in this unconventional superconductor. The lifetime of the excited electrons evidently decreases as the pressure increases from 0 to 2.2 GPa, and then increases with further compression. The vibrational properties of the A1g phonon mode exhibit similar behavior, with a pronounced frequency reduction appearing at approximately 2.3 GPa. The dual evidence reveals the enhanced electron-phonon coupling strength with pressure in FeTe0.5Se0.5. Our results give an insight into the role of the electron-phonon coupling effect in iron-based superconductors.

引用

页数：12

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