5 July 1996 Band states of the condensate in superconducting superlattices
Author Affiliations +
We have studied theoretically a superconducting system with the order parameter periodic in space. The period of such a superconducting superlattice (SS) should be of the order of the coherence length (xi) (T), so that it is a macroscopic value in comparison with the atomic scale. The spectrum of the condensate in such structures becomes of the band type with a finite number of energy bands. Splitting of the spectrum of the condensate into the allowed and forbidden energy bands starts from a certain threshold level of modulation of the order parameter by the superlattice. In view of periodicity of the system, the current states of the condensate in excited bands at higher values of energy can exist in principle along with the conventional Josephson current, corresponding to the lowermost energy band. The presence of the SS energy bands makes possible the transitions of the condensate as a macroscopic system from one quantum state to another. A set of equations in the framework of the Ginzburg-Landau scheme has been obtained and current-phase relations for a SS have been calculated. The crossover from the Josephson-like behavior of a SS (the high value of the constant (lambda) , characterizing suppression of the superconducting order parameter) to the homogeneous current-carrying state has been investigated. It has been shown, that as (lambda) decreases, the maximum superconducting SS current is displaced to a range of a lower value of the phase difference in the lattice period. We study the band states stability of the SS.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gurami Alexandrov Gogadze, Gurami Alexandrov Gogadze, } "Band states of the condensate in superconducting superlattices", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250285; https://doi.org/10.1117/12.250285


Why only hole conductors can be superconductors
Proceedings of SPIE (March 06 2017)
Magnetism-coupled vortex matter
Proceedings of SPIE (December 08 1998)
Preparation Of High Tc And Jc Films Of Ba2YCu3O7_8 By...
Proceedings of SPIE (August 22 1988)
Andreev bound states in superconductor/ferromagnetic junctions
Proceedings of SPIE (September 05 2000)

Back to Top