Reentrant superconductivity in a hybrid heterostructure with a high transparency barrier

Within the framework of the self-consistent effective field approximation of the time-dependent perturbation theory, an influence of the electron tunneling on the spontaneously induced order parameters in a normal metal-superconductor hybrid structure is considered. For a normal-metal model, which does not take into account electron-electron scattering, as well as electron-phonon coupling, a critical barrier transparency, corresponding to the disappearance of superconductivity in the ground state, was obtained. The presence of incoherent excitations leads to a complex relationship between the effects of ordering, thermal fluctuations, and tunneling. Near the critical barrier transparency, this can stabilize a superconducting state in the certain temperature intervals. As a result, a reentrant superconductivity phenomenon was observed. The studied spectral properties of the hybrid structure reflect the existence of both coherent and incoherent elementary excitations.

Automated summary

In the framework of the self-consistent effective field approximation of the time-dependent perturbation theory, the influence of electron tunneling on spontaneously induced order parameters in a normal metal-superconductor hybrid structure was investigated. It was found that near the critical barrier transparency, a reentrant superconductivity phenomenon can be observed. Spectral properties of the hybrid structure show the coexistence of both coherent and incoherent elementary excitations.