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Eguchi, Ritsuko Research Institute for Interdisciplinary Science, Okayama University ORCID Kaken ID researchmap
Senda, Megumi Graduate School of Natural Science and Technology, Okayama University
Uesugi, Eri Graduate School of Natural Science and Technology, Okayama University
Goto, Hidenori Research Institute for Interdisciplinary Science, Okayama University Kaken ID researchmap
Fujiwara, Akihiko Department of Nanotechnology for Sustainable Energy, Kwansei Gakuin University
Imai, Yasuhiko Japan Synchrotron Radiation Research Institute (JASRI)
Kimura, Shigeru Japan Synchrotron Radiation Research Institute (JASRI)
Noji, Takashi Department of Applied Physics, Tohoku University
Koike, Yoji Department of Applied Physics, Tohoku University
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 x 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 (T-t), the superconducting transition (T-c), and the zero resistivity (T-c(zero)) are closely related to the value of c in thin crystals of FeSe1-xTex.
Materials Research Express
© 2020 The Author(s).
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