Low Temperature Physics: 36, 1004 (2010); https://doi.org/10.1063/1.3521570 (4 pages)
Физика Низких Температур: Том 36, Выпуск 10-11 (Октябрь 2010), c. 1244-1247    ( к оглавлению , назад )

Superconducting properties of a two-dimensional doped semiconductor

V.M. Loktev

Bogolyubov Institute for Theoretical Physics of NAS of Ukraine, 14b Metrologichna Str., Kiev 03680, Ukraine

V. Turkowski

Department of Physics and NanoScience and Technology Center, University of Central, Florida, Orlando, FL 32816
E-mail: vturkows@mail.ucf.edu

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;
PACS: 74.20.Fg BCS theory and its development;
PACS: 74.20.Rp Pairing symmetries (other than s-wave);
PACS: 74.72.–h Cuprate superconductors.

Key words: pseudogap, cuprate superconductors, spin-wave pairing.