Fe(Se,Te)超导薄膜的研究进展

Research Progress of Fe(Se,Te) Superconducting Films

摘要:

由于薄膜材料所具有特殊的维度效应、界面效应等使其相比于块体材料具有独特的优势。铁硫族超导体Fe(Se,Te)由于具有简单的晶体结构，更加有利于对于超导机理的研究。研究发现在SrTiO₃（STO）衬底上生长的单层FeSe超导薄膜显著提高了超导转变温度（T_c），这使得FeSe超导薄膜的研究成为理解非常规超导体机制的新方向。此外，在FeSe多层膜的研究中也发现了相比于块体材料临界转变温度提升的现象。本文从Fe(Se,Te)超导薄膜的制备和应力效应、界面效应等因素对T_c增强两方面综述了近年来的研究成果。

Abstract:

Because of the special dimension effect and interface effect, film materials have unique advantages compared with bulk materials. Fe(Se,Te), an iron-sulfur superconductor, is more conducive to the study on superconducting mechanism because of its simple crystal structure. It has been found that single-layer FeSe superconducting films grown on SrTiO₃ (STO) substrate significantly increase the superconducting transition temperature (T_c), which makes the study on FeSe superconducting films a new direction to understand the mechanism of unconventional superconductors. In addition, it is also found that the critical transition temperature of FeSe multilayer films is higher than that of bulk materials. The recent research achievements on the preparation of Fe(Se,Te) superconducting films and the enhancement of T_c by stress effect and interface effect were reviewed.