Spin-phonon coupling in the superconductor FeTe0.5Se0.5 from first-principles calculations

被引：5

作者：

Li, Jian

Huang, GuiQin ^{[1
]}

机构：

[1] Nanjing Normal Univ, Dept Phys, Nanjing 210023, Jiangsu, Peoples R China

来源：

SOLID STATE COMMUNICATIONS | 2013年 / 159卷

基金：

中国国家自然科学基金;

关键词：

Iron-based superconductor; Lattice dynamics; Electron-phonon interaction; First-principles;

D O I：

10.1016/j.ssc.2013.01.007

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We present a first-principles pseudopotential study on the phonon structure and the electron-phonon (EP) interaction of superconductor FeTe0.5Se0.5 in both the nonmagnetic (NM) and striped antiferromagnetic (SAF) phases with the ordered and disordered structural models. The calculations give similar results for the two different structural models, implying that the superconductivity in FeTe0.5Se0.5 may be insensitive to the local atomic structure. Comparing the phonon behavior in the SAF phase with that in the NM phase, we find that the spin-lattice interaction can lead to the phonon softening and increase EP coupling constant lambda by about 50%. This enhancement EP coupling may play an important role in the superconducting pairing, but this mechanism alone cannot explain the high T-c in superconductor FeTe0.5Se0.5 (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：45 / 48

页数：4

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