Bound State and Order Parameter Mixing Effect by Nonmagnetic Impurity Scattering in Two-band Superconductors

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概要

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• We investigate nonmagnetic impurity effects in two-band superconductors, focusing on the effects of interband impurity scatterings. Within the Born approximation, it is known that interband scatterings mix order parameters in the two bands. In particular, only one averaged energy gap appears in the excitation spectrum in the dirty limit [G. Gusman: J. Phys. Chem. Solids 28 (1967) 2327]. In this paper, we take into account the interband scattering within the t-matrix approximation beyond the Born approximation in the previous work. We show that, although the interband scattering is responsible for the mixing effect, this effect becomes weak when the interband scattering becomes very strong. In the strong interband scattering limit, a two-gap structure corresponding to two order parameters recovers in the superconducting density of states. We also show that a bound state appears around a nonmagnetic impurity depending on the phase of interband scattering potential.

• 社団法人日本物理学会の論文
• 2002-08-15

著者

• Ohashi Yoji

  Department Of Physics University Of Tsukuba

• Ohashi Yoji

  Department Of Physics University Of Toronto:institute Of Physics University Of Tsukuba

• Ohashi Yoji

  Department Of Physics Tokyo Institute Of Technology

• Ohashi Yoji

  Department Of Material Physics Faculty Of Engineering Science Osaka University

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• Bound State and Order Parameter Mixing Effect by Nonmagnetic Impurity Scattering in Two-band Superconductors
• Resonance State Localized around Nonmagnetic Impurity with Unitarity Scattering in Two-Dimensional d-Wave Superconductor
• Temperature Dependence of Uniform Susceptibility in High-T_c Superconductors
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