Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-07-08
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 5 figures, to appear in J. Phys. Soc. Jpn. Vol. 79, No. 9 (2010)
Scientific paper
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 $T_{\rm c}$ 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 LaOs$_4$Sb$_{12}$.
Koga Mikito
Kusunose Hiroaki
Matsumoto Masashige
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