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政大機構典藏 > 理學院 > 應用物理研究所 > 期刊論文 > Item 140.119/140848

Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/140848

Title:	Pressure-dependent topological superconductivity on the surface of FeTe0.5Se0.5
Authors:	楊志開 Yang, Chih-Kai Lee, Chi-Hsuan
Contributors:	應物所
Keywords:	topological superconductivity;exchange interaction;pairing mechanism;iron-based superconductor;pressure variation
Date:	2022-01
Issue Date:	2022-07-11 09:33:20 (UTC+8)
Abstract:	FeTe1−xSex is a family of iron-based superconductors with its critical temperature (Tc) dependent on the composition of Se. A well-known Tc is 14.5 K for x = 0.45, which exhibits an s-wave superconducting gap between the topological superconducting surfaces states. Exchange interaction between the electrons has been proposed as the mechanism behind the formation of Cooper pairs for the sample of FeTe0.5Se0.5. In this article we provide further proof that exchange interaction, and hence the associated Tc, depends on the applied pressure on FeTe0.5Se0.5. Using density functional calculations for electrons and phonons and the Bardeen–Cooper–Schrieffer (BCS) theory for superconductivity, we found that Tc and superconducting gap for FeTe0.5Se0.5 soars under increasing compression, consistent with the results of experiment.
Relation:	New Journal of Physics, Vol.24, 023001
Data Type:	article
DOI 連結:	https://doi.org/10.1088/1367-2630/ac4922
DOI:	10.1088/1367-2630/ac4922
Appears in Collections:	[應用物理研究所 ] 期刊論文

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