Control of structural transition in FeSe1-xTex thin films by changing substrate materials

Yoshinori Imai, Yuichi Sawada, Fuyuki Nabeshima, Daisuke Asami, Masataka Kawai, Atsutaka Maeda

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Iron chalcogenide superconductors FeSe1-xTex are important materials for investigating the relation be-tween the superconductivity and the orbital and/or electronic nematic order, because the end member material FeSe exhibits a structural transition without a magnetic phase transition. However, the phase separation occurs in the region of 0.1 ≤ x ≤ 0.4 for bulk samples, and it prevents the complete understanding of this system. Here, we report the successful fabrication of epitaxial thin films of FeSe1-xTex with 0 ≤ x ≤ 0.7, which includes the phase-separation region, on LaAlO3 substrates via pulsed laser deposition. In the temperature dependences of differential resistivity for these films with 0 ≤ x ≤ 0.3, the dip- or peak- anomalies, which are well-known to be originated from the structural transition in FeSebulk samples, are observed at the characteristic temperatures, T∗. The dopingtemperature (x-T) phase diagram of FeSe1-xTex films clearly shows that T∗ decreases with increasing x, and that Tc suddenly changes at a certain Te content where T∗ disappears, which turns out to be commonly observed for both films on LaAlO3 and CaF2. These indicate the importance of controlling the structural transition to achieve high Tc in iron chalcogenides.

Original languageEnglish
Article number46653
JournalScientific reports
Volume7
DOIs
Publication statusPublished - 2017

ASJC Scopus subject areas

  • General

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