Publication Details

Zhuang, J., Yeoh, W. Kong., Cui, X., Xu, X., Du, Y., Shi, Z., Ringer, S. P., Wang, X. & Dou, S. Xue. (2014). Unabridged phase diagram for single-phased FeSexTe1-x thin films. Scientific Reports, 4, 1-6.


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 (TC = 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.

Grant Number

ARC/DP120100095, ARC/DP140102581