FeSe1.xTex films with 0 ≤ x ≤ 1, including the region of 0:1≤ x ≤ 0:4, which is well known to be the ′phase-separation region,′ via pulsed laser deposition that is a thermodynamically nonequilibrium method. In the resulting films, we observe a giant enhancement of the superconducting transition temperature, Tc, in the region of 0:1 ≤ x ≤ 0:4: The maximum value reaches 23 K, which is ~1.5 times as large as the values reported for bulk samples of FeSe1.xTex. We present a complete phase diagram of FeSe1.xTex films. Surprisingly, a sudden suppression of Tc is observed at 0:1 < x < 0:2, whereas Tc increases with decreasing x for 0:2 ≤ x < 1. Namely, there is a clear difference between superconductivity realized in x=0.0:1 and in x≥0:2. To obtain a film of FeSe1.xTex with high Tc, the controls of the Te content x and the in-plane lattice strain are found to be key factors.
|Number of pages||4|
|Journal||Proceedings of the National Academy of Sciences of the United States of America|
|Publication status||Published - 2015 Feb 17|
- Complete phase diagram
- Compressive strain
- Thin-film growth
ASJC Scopus subject areas