Effect of Impurities with Internal Structure on Multiband Superconductors —Possible Enhancement of Transition Temperature—

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概要

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• We study inelastic (dynamical) impurity scattering effects in two-band superconductors with the same ($s_{++}$ wave) or different ($s_{\pm}$ wave) sign order parameters. We focus on the enhancement of the superconducting transition temperature $T_{\text{c}}$ by magnetic interband scattering with the interchange of crystal-field singlet ground and multiplet excited states. Either the $s_{++}$-wave or $s_{\pm}$-wave state is favored by the impurity-mediated pairing, which depends on the magnetic and nonmagnetic scattering strengths derived from the hybridization of the impurity states with the conduction bands. The details are examined for the singlet–triplet configuration that is suggestive of Pr impurities in the skutterudite superconductor LaOs4Sb12.

• 2010-09-15

著者

• Kusunose Hiroaki

  Department Of Material Physics Faculty Of Engineering Science Osaka University

• Koga Mikito

  Department Of Education Shizuoka University

• Matsumoto Masashige

  Department Of Physics Faculty Of Science Shizuoka University

• Koga Mikito

  Department of Physics, Faculty of Education, Shizuoka University, 836 Oya, Suruga-ku, Shizuoka 422-8529, Japan

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