論文

査読有り 責任著者
2018年5月1日

Temperature dependence of differential conductance in Co-based Heusler alloy Co2TiSn and superconductor Pb junctions

Physica B: Condensed Matter
  • Ryutaro Ooka
  • ,
  • Iduru Shigeta
  • ,
  • Rie Y. Umetsu
  • ,
  • Akiko Nomura
  • ,
  • Kunio Yubuta
  • ,
  • Touru Yamauchi
  • ,
  • Takeshi Kanomata
  • ,
  • Masahiko Hiroi

536
開始ページ
289
終了ページ
292
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.physb.2017.10.055
出版者・発行元
Elsevier B.V.

We investigated temperature dependence of differential conductance G(V) in planar junctions consisting of Co-based Heusler alloy Co2TiSn and superconductor Pb. Ferromagnetic Co2TiSn was predicted to be half-metal by first-principles band calculations. The spin polarization P of Co2TiSn was deduced to be 60.0% at 1.4K by the Andreev reflection spectroscopy. The G(V) spectral shape was smeared gradually with increasing temperature and its structure was disappeared above the superconducting transition temperature Tc. Theoretical model analysis revealed that the superconducting energy gap Δ was 1.06meV at 1.4K and the Tc was 6.8K, indicating that both values were suppressed from bulk values. However, the temperature dependent Δ(T) behavior was in good agreement with that of the Bardeen-Cooper-Schrieffer (BCS) theory. The experimental results exhibit that the superconductivity of Pb attached to half-metallic Co2TiSn was kept the conventional BCS mechanism characterized strong-coupling superconductors while its superconductivity was slightly suppressed by the superconducting proximity effect at the Co2TiSn/Pb interface.

リンク情報
DOI
https://doi.org/10.1016/j.physb.2017.10.055
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85035071486&origin=inward
ID情報
  • DOI : 10.1016/j.physb.2017.10.055
  • ISSN : 0921-4526
  • SCOPUS ID : 85035071486

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