Stimulation of Superconductivity in Submolecular Structures With Weakly Coupled Superconducting Layers

Abstract

Electromagnetic and superconducting properties are considered in superconducting layers separated by interlayer with the thickness of the oxide layer 10-20 A (the so-called multilayer lattices of (S-D-S) n-type). In particular, the phenomenon of stimulation of superconductivity is expounded and specific dependence on the number of oxide evaporated layers and their thickness is obtained. The Josephson array defectivity is considered with the frustration parameter. The number of states in these models shows a wide variety of critical behavior as a function of the frustration f(0 <; f <; 1). The characteristics defined densities of electronic states of superconducting and normal-metal layers in S/N superlattice are presented. It is clear that even with the constant interaction conservation between the nearest layers, which in the same for all the layers, the frustration introduction over the layers result in a hysteresis in T_c (n), i.e., in the irreversibility phenomena so characteristic of high-temperature superconductors. The connection of this result with tunneling spectra of high-Tc superconductors such as Yba_2Cu_3O_(7-d), (YBCO) thin films deposited on LaAlO_3 substrates is observed.