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.
Keywords
Cite
@article{arxiv.cond-mat/0305161,
title = {Temperature-doping phase diagram of layered superconductors},
author = {V. M. Loktev and V. Turkowski},
journal= {arXiv preprint arXiv:cond-mat/0305161},
year = {2009}
}
Comments
To be published in Phys. Rev. B