Transport properties of epitaxial films for superconductor NbN and half-metallic Heusler alloy Co2MnSi under high magnetic fields

Iduru Shigeta, Takahide Kubota, Yuya Sakuraba, Shojiro Kimura, Satoshi Awaji, Koki Takanashi, Masahiko Hiroi

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Transport properties were investigated for epitaxial films of superconductor NbN and half-metallic Heusler alloy Co2MnSi under high magnetic fields up to 17 T. The superconducting transition temperature Tc of NbN/Co2MnSi/Au trilayer films was determined to be 16.1K in the absence of magnetic field. Temperature dependence of the resistivity ρ(T) was measured in both magnetic fields parallel and perpendicular to the surface of NbN/Co2MnSi/Au trilayer films. The activation energy U0(H) for vortex motion of the trilayer films in both magnetic fields was well fitted above 5 T by the similar model with the exponents in the field dependence of the pinning force density. From the resistivity ρ(T) measurements under high magnetic fields, the upper critical field Hc2(0) at 0 K was also deduced to be μ0Hc2 (0)=23.2T for the parallel magnetic filed and μ0Hc2 (0)=15.8T for the perpendicular magnetic field, respectively. The experimental results under magnetic fields revealed the superconductivity of the NbN layer was affected by the interplay between the superconducting NbN layer and the half-metallic Co2MnSi layer.

本文言語English
ページ(範囲)310-313
ページ数4
ジャーナルPhysica B: Condensed Matter
536
DOI
出版ステータスPublished - 2018 5月 1

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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