Magnetism and superconductivity of S-substituted FeTe

JOURNAL OF ALLOYS AND COMPOUNDS

卷:630

Article

Ciechan, A.¹  Winiarski, M. J.²  Samsel-Czekala, M.² 

[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

[2] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50422 Wroclaw, Poland

关键词: High-T-c superconductors;    Magnetically ordered materials;    Metals and alloys;    Crystal structure;    Electronic band structure;    Phase transitions;   

DOI  :  10.1016/j.jallcom.2015.01.024

来源: Elsevier

【 摘 要 】

The influence of a partial substitution with sulfur into Te sites on the crystal, electronic and magnetic structures of FeTe is investigated by DFT calculations. The results reveal a phase transition from the antiferromagnetic double-stripe order for pure FeTe to the single-stripe order for S-substituted samples, which coincides with the previously observed appearance of the superconducting state. The magnetic transition is caused by the variations of the average chalcogen position in the unit cell. The analyzed normal-state properties of Fe(Te,S) and Fe(Se;S) compounds pounds allow a detection of the well resolved nesting-driven magnetic fluctuations only for superconducting samples, consistent with their antiferromagnetic ground state. Thus, the role of an S-substitution is a suppression of the double-stripe antiferromagnetic order to give rise to the single-stripe correlations, which are associated with an occurrence of superconductivity in Fe(Te, S) solid solutions. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free