Influence of the Impurity-scattering on Zero-bias Conductance Peak in Ferromagnet/Insulator/d-wave Superconductor Junctions

Nobukatsu Yoshida; Yasuhiro Asano; Hiroyoshi Itoh; Yukio Tanaka; Jun-ichiro Inoue; Satoshi Kashiwaya

doi:10.1143/jpsj.72.895

Nobukatsu Yoshida, Yasuhiro Asano, Hiroyoshi Itoh, Yukio Tanaka, Jun-ichiro Inoue, Satoshi Kashiwaya

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Keywords: Andreev reflection, d-wave superconductor, zero-energy states, zero-bias conductance peak, disorder, ferromagnet, spin-polarized tunneling

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2003 Volume 72 Issue 4 Pages 895-899

DOI https://doi.org/10.1143/jpsj.72.895

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Abstract

Effects of impurity-scattering on a zero-bias conductance peak in ferromagnet/insulator/d-wave superconductor junctions are theoretically studied. The impurities are introduced through the random potential in ferromagnets near the junction interface. As in the case of normal-metal/insulator/d-wave superconductor junctions, the magnitude of zero-bias conductance peak decreases with increasing the degree of disorder. However, when the magnitude of the exchange potential in ferromagnet is sufficiently large, the random potential can enhance the zero-bias conductance peak in ferromagnetic junctions.

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