The sign of interband interaction and stability of the superconducting ground state in the multiband model |
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| Authors: | N. Kristoffel T. örd P. Konsin |
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| Affiliation: | (1) Dipartimento di Fisica dell'Università, Via Celoria 16, I-20133 Milano;(2) Institute of Physics, Estonian Academy of Sciences, Riia 142, EE2400 Tartu, Estonia;(3) Present address: Institute of Physics, Estonian Academy of Sciences, Riia 142, EE2400 Tartu, Estonia |
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| Abstract: | Summary It is stressed that the stability of the superconducting ground state in the two-band model is guaranteed for both signs of the leading interband interactionW. Thereby the requirement for the energy minimum fixed the phase differences of two order parameters as |ϕ1-ϕ2|=0,2π, … ifW<0 and |ϕ1-ϕ2|=π 3π, … ifW>0, and this difference is reflected in the ground-state wave function. |
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| Keywords: | Other topics in lattice dynamics and crystal statistics |
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