Temperature-doping phase diagram of layered superconductors

Details Temperature-doping phase diagram of layered superconductors Temperature-doping phase diagram of layered superconductors

2003-05-08

arxiv.org/abs/cond-mat/0305161v1

Phys. Rev. B 67, 214510 (2003)

Physics

Condensed Matter

Superconductivity

To be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.214510

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.

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