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A microscopic theory of the energy spectrum of the Kronig-Penney superconducting superlattice model

1991; Elsevier BV; Volume: 77; Issue: 2 Linguagem: Inglês

10.1016/0038-1098(91)90872-s

1879-2766

Yukio Tanaka, Masaru Tsukada,

Chemical and Physical Properties of Materials

The energy spectrum of the quasiparticle state in the Kronig-Penney superlattice model is obtained with use of Green's function method. The supercurrent shows non-monotonous behavior as a function of the phase difference of the pair potential between the adjacent superconductors. From the energy spectrum, the presence of the three states, i.e., superconducting state, gapless superconducting state and normal state is elucidated and the phase diagram is obtained for the parameters space of the lattice period and the phase difference.