Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe1-xTex thin films

Yoshinori Imai, Yuichi Sawada, Fuyuki Nabeshima, Atsutaka Maeda

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1937-1940
Number of pages4
JournalProceedings of the National Academy of Sciences of the United States of America
Volume112
Issue number7
DOIs
Publication statusPublished - 2015 Feb 17
Externally publishedYes

Keywords

  • Complete phase diagram
  • Compressive strain
  • FeSeTe
  • Thin-film growth

ASJC Scopus subject areas

  • General

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