Work

Coherent phonon dynamics and electron-phonon coupling of (Li 0.8 Fe 0.2 )OHFeSe revealed with femtosecond transient optical spectroscopy

Year: 2025

Type: article

Abstract: Femtosecond transient optical spectroscopy was used to study the coherent phonon dynamics and electron-phonon coupling in (Li 0.8 Fe 0.2 )OHFeSe. The temperature-dependent behavior of both fast and slow relaxation processes was investigated, providing insight into the origins of relaxation processes. The fast relaxation process reflects interaction of e - ph coupling. While the slow relaxation process is attributed to the phonon bottleneck effect. The coherent phonon oscillations observed at all measured temperatures are attributed to the A 1 g phonon mode, which corresponds to the in-phase vibration of Se anions along the c -axis. The redshift phenomenon in the coherent phonon is well explained by the phonon anharmonic effect. The e - ph coupling constant λ is estimated to be 0.23 using the Allen model.

Source: Optics Express

DOI: 10.1364/oe.559950

Authors: Yuxian Wu, Yong Li, Ning Li, Shulong Li, Yongliang Chen, Yong Zhao

Institutions: Southwest Jiaotong University, Chengdu Normal University, Peac Institute of Multiscale Sciences, Fujian Normal University

Language: English

Topic: Iron-based superconductors research

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

OpenAlex ID: W4408927629

FWCI: 0.159

Cites: 38

Cited by: 1

Related to: 10