Unabridged phase diagram for single-phased FeSexTe1-x thin films

作者：Zhuang, Jincheng; Yeoh, Wai Kong; Cui, Xiangyuan; Xu, Xun; Du, Yi; Shi, Zhixiang^*; Ringer, Simon P.; Wang, Xiaolin; Dou, Shi Xue

来源：Scientific Reports, 2014, 4(1): 7273.

DOI：10.1038/srep07273

• SUPERCONDUCTIVITY
• TEMPERATURE
• SPIN

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 FeSexTe1-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.

• 出版日期2014-12-2
• 单位东南大学