Noise Spectroscopy Investigation of Aging-Induced Degradation in Iron-Chalcogenide Superconductors

Costantino Mauro, Carlo Barone, Sergio Pagano, Yoshinori Imai, Fuyuki Nabeshima, Atsutaka Maeda

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Iron-based superconductors are subjected to aging when exposed to unprotected environmental conditions, with a consequent degradation of their superconductive properties. The understanding of aging effects is important in view of practical applications. In this paper, electric transport and voltage-noise measurements are reported on FeSe and FeSe 0.5Te0.5 thin films, just after fabrication and after long aging in protected environment. The pristine films show a superconducting transition at temperatures ranging from 9 to 12 K for FeSe and at 17 K for FeSe0.5Te0.5, and an overall metallic behavior above T c. Preserving the samples for several months in low-humidity and low-pressure conditions, the FeSe0.5Te0.5 films show no clear modification of the electrical conduction mechanisms. Conversely, for the FeSe films, the superconductive transition is no longer present, at least for temperatures above 8 K, and an overall larger resistivity is observed, with a characteristic upturn at low temperatures (T > Tmin ≈ 50K). An interpretation in terms of weak-localization processes is proposed.

本文言語English
論文番号7740093
ジャーナルIEEE Transactions on Applied Superconductivity
27
4
DOI
出版ステータスPublished - 2017 6月
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学

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