Substrate dependence of structural and transport properties in FeSe 0.5Te0.5 thin films

Masafumi Hanawa, Ataru Ichinose, Seiki Komiya, Ichiro Tsukada, Takanori Akiike, Yoshinori Imai, Tatsuo Hikage, Takahiko Kawaguchi, Hiroshi Ikuta, Atsutaka Maeda

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

In order to clarify the best condition for the growth of iron chalcogenide superconductor thin films, we investigated the effect of the substrate on the transport and structural properties of films. Thin films of FeSe 0.5Te0.5 grown by pulsed laser deposition were characterized by DC electrical resistivity, Hall effect, X-ray diffraction measurements, and transmission electron microscopy (TEM) observation. The c-axis length of the FeSe0.5Te0.5 thin films revealed a non-systematic change with the cell constants of the substrates. In the films with poor or no superconductivity, we found the occurrence of oxygen penetration to the film and the formation of amorphous layer between the film and the substrate. The origin of the oxygen penetration and the amorphous layer was the chemical properties of substrate. From the chemical viewpoint, LaAlO3 and MgO substrates were confirmed to be appropriate to grow FeSe 0.5Te0.5 films.

Original languageEnglish
Article number053101
JournalJapanese journal of applied physics
Volume50
Issue number5 PART 1
DOIs
Publication statusPublished - 2011 May
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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