Inhomogeneous superconductivity in thin crystals of FeSe1-xTex (x = 1.0, 0.95, and 0.9)

Ritsuko Eguchi, Megumi Senda, Eri Uesugi, Hidenori Goto, Akihiko Fujiwara, Yasuhiko Imai, Shigeru Kimura, Takashi Noji, Yoji Koike, Yoshihiro Kubozono

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated the temperature dependence of resistivity in thin crystals of FeSe1-xTex (x = 1.0, 0.95, and 0.9), though bulk crystals with 1.0 ≧ × ≧ 0.9 are known to be non-superconducting. With decreasing thickness of the crystals, the resistivity of x = 0.95 and 0.9 decreases and reaches zero at a low temperature, which indicates a clear superconducting transition. The anomaly of resistivity related to the structural and magnetic transitions completely disappears in 55- to 155-nm-thick crystals of x = 0.9, resulting in metallic behavior in the normal state. Microbeam x-ray diffraction measurements were performed on bulk single crystals and thin crystals of FeSe1-xTex. A significant difference of the lattice constant, c, was observed in FeSe1-xTex, which varied with differing Te content (x), and even in crystals with the same x, which was mainly caused by inhomogeneity of the Se/Te distribution. It has been found that the characteristic temperatures causing the structural and magnetic transition (Tt), the superconducting transition (Tc), and the zero resistivity (Tc zero) are closely related to the value of c in thin crystals of FeSe1-xTex.

Original languageEnglish
Article number036001
JournalMaterials Research Express
Volume7
Issue number3
DOIs
Publication statusPublished - 2020

Keywords

  • iron-based superconductor
  • microbeamXRD
  • thin crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

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