Theoretical study of point-contact Andreev reflection spectroscopy for ferromagnetic-metal/multi-band superconductor junctions

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  • Hiroyuki Ohtori
    Institute of Applied Physics, University of Tsukuba 1 , Tsukuba, Ibaraki 305-8573, Japan
  • Hiroshi Imamura
    Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology 2 , 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan

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<jats:p>This paper theoretically analyzes the Andreev reflection in normal-conductor/multi-band super-conductor junctions. We applied Bogoliubov-de Gennes equations to the case of superconductors with extended s-waves and calculated the respective point-contact Andreev reflection (PCAR) spectra. Our results showed that the PCAR measurement with high-Tc superconductivity can be used as a tool for measuring the spin-polarization of ferromagnetic materials.</jats:p>

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