Low Temperature Physics: 36, 1004 (2010); https://doi.org/10.1063/1.3521570 (4 pages)
Fizika Nizkikh Temperatur: Volume 36, Number 10-11 (October 2010), p. 1244-1247 ( to contents , go back )
Superconducting properties of a two-dimensional doped semiconductor
Bogolyubov Institute for Theoretical Physics of NAS of Ukraine, 14b Metrologichna Str., Kiev 03680, Ukraine
Department of Physics and NanoScience and Technology Center, University of Central, Florida, Orlando, FL 32816
Received April 12, 2010
In this paper, we study the superconducting properties of a two-dimensional model with an additional (insulating) gap Δins, which depends on temperature and doping. In particular, we study the doping evolution of the Berezinskii–Kosterlitz–Thouless critical temperature Tc and the superconducting pseudogap temperature TcMF at different values of Δins by taking into account the hydrodynamic fluctuations of the superconducting order parameter. We demonstrate that the presence of the gap Δins affect the values of the superconducting gap and temperatures Tc and TcMF in the region of the carrier densities where the gap Δins approaches to zero. In particular, the derivatives of these quantities have a jump in this region. We discuss possible relevance of the results to high-temperature superconductors.
PACS: 74.20.–z Theories and models of superconducting state;
Key words: pseudogap, cuprate superconductors, spin-wave pairing.