单相FeSe(x)Te(1-x)薄膜的完整相图。

Unabridged phase diagram for single-phased FeSe(x)Te(1-x) thin films.

作者信息

Zhuang Jincheng, Yeoh Wai Kong, Cui Xiangyuan, Xu Xun, Du Yi, Shi Zhixiang, Ringer Simon P, Wang Xiaolin, Dou Shi Xue

机构信息

1] Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189, People's Republic of China [2] Institute for Superconducting and Electronic Materials, University of Wollongong, North Wollongong, New South Wales 2500, Australia.

1] Institute for Superconducting and Electronic Materials, University of Wollongong, North Wollongong, New South Wales 2500, Australia [2] Australian Centre for Microscopy and Microanalysis, University of Sydney, Sydney, New South Wales 2006, Australia [3] School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, New South Wales 2006, Australia.

出版信息

Sci Rep. 2014 Dec 2;4:7273. doi: 10.1038/srep07273.

DOI:10.1038/srep07273

PMID:25449669

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4250907/

Abstract

A complete phase diagram and its corresponding physical properties are essential prerequisites to understand the underlying mechanism of iron-based superconductivity. For the structurally simplest 11 (FeSeTe) system, earlier attempts using bulk samples have not been able to do so due to the fabrication difficulties. Here, thin FeSe(x)Te(1-x) films with the Se content covering the full range (0 ≤ x ≤ 1) were fabricated by using pulsed laser deposition method. Crystal structure analysis shows that all films retain the tetragonal structure in room temperature. Significantly, the highest superconducting transition temperature (T(C) = 20 K) occurs in the newly discovered domain, i.e., 0.6 ≤ x ≤ 0.8. The single-phased superconducting dome for the full Se doping range is the first of its kind in iron chalcogenide superconductors. Our results present a new avenue to explore novel physics as well as to optimize superconductors.

摘要

完整的相图及其相应的物理性质是理解铁基超导潜在机制的基本前提。对于结构最简单的11（FeSeTe）体系，早期使用块状样品的尝试由于制备困难而未能实现这一点。在此，通过脉冲激光沉积法制备了硒含量覆盖整个范围（0≤x≤1）的FeSe(x)Te(1-x)薄膜。晶体结构分析表明，所有薄膜在室温下均保持四方结构。值得注意的是，最高超导转变温度（T(C)=20K）出现在新发现的区域，即0.6≤x≤0.8。全硒掺杂范围内的单相超导穹顶在硫族铁化物超导体中尚属首例。我们的结果为探索新物理以及优化超导体提供了一条新途径。