Temperature-doping phase diagram of layered superconductors

Abstract

The superconducting properties of a layered system are analyzed for the cases of zero- and non-zero angular momentum of the pairs. The effective thermodynamic potential for the quasi-2D XY-model for the gradients of the phase of the order parameter is derived from the microscopic superconducting Hamiltonian. The dependence of the superconducting critical temperature T_c on doping, or carrier density, is studied at different values of coupling and inter-layer hopping. It is shown that the critical temperature T_c of the layered system can be lower than the critical temperature of the two-dimensional Berezinskii-Kosterlitz-Thouless transition T_BKT at some values of the model parameters, contrary to the case when the parameters of the XY-model do not depend on the microscopic Hamiltonian parameters.

To be published in Phys. Rev. B

References in corpus (5)

• Phase Fluctuations and Pseudogap Phenomena
• Finite Temperature Time-Dependent Effective Theory for the Phase Field in two-dimensional d-wave Neutral Superconductor
• An effective Hamiltonian for phase fluctuations on a lattice: an extended XY model
• Experimental implications of quantum phase fluctuations in layered superconductors
• Crossover from superfluidity to superconductivity in a system with doping dependent attraction

Cited by in corpus (2)

• Possible high-temperature superconductivity in multilayer graphane: can the cuprates be beaten?
• On the theory of pseudogap anisotropy in the cuprate superconductors