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

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)310-313
Number of pages4
JournalPhysica B: Condensed Matter
Volume536
DOIs
Publication statusPublished - 2018 May 1

Keywords

  • Activation energy
  • Epitaxial film
  • Half-metal
  • Heusler alloy
  • Superconductor
  • Upper critical field

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Transport properties of epitaxial films for superconductor NbN and half-metallic Heusler alloy Co<sub>2</sub>MnSi under high magnetic fields'. Together they form a unique fingerprint.

Cite this