Temperature-doping phase diagram of layered superconductors

V. M. Loktev; V. Turkowski

doi:10.1103/PhysRevB.67.214510

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Temperature-doping phase diagram of layered superconductors

V. M. Loktev, V. Turkowski

DOI 10.1103/PhysRevB.67.214510 · Physical Review B

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Abstract

The superconducting properties of a layered system are analyzed for the cases of zero and nonzero angular momenta of the pairs. The effective thermodynamic potential for the quasi-two-dimensional 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 Tc on doping, or carrier density, is studied at different values of coupling and interlayer hopping. It is shown that the critical temperature Tc of the layered system can be lower than the critical temperature of the two-dimensional Berezinskii-Kosterlitz-Thouless transition TBKT at some values of the model parameters, contrary to the case in which the parameters of the XY model do not depend on the microscopic Hamiltonian parameters.