Superconducting fluctuations at low temperature
Abstract
The effect of fluctuations on the transport and thermodynamic properties of two-dimensional superconductors in a perpendicular magnetic field is studied at low temperature T<<Tc0. The fluctuation conductivity is calculated in the framework of perturbation theory with the help of the usual diagram technique. It is shown that in the dirty case the Aslamazov-Larkin, Maki-Thompson, and density of states contributions are of the same order. At extremely low temperature T/Tc0<<[H-Hc2(0)]/Hc2(0) the total fluctuation correction to the normal conductivity is negative in the dirty limit and depends on the external magnetic field logarithmically δσ~ln[H-Hc2(0)]. In the nonlocal clean limit, the Aslamazov-Larkin contribution to conductivity is evaluated with the aid of Helfand-Werthamer theory. The longitudinal and Hall conductivities are found. The fluctuating magnetization is calculated in the one-loop and two-loop approximations.
- Publication:
-
Physical Review B
- Pub Date:
- May 2001
- DOI:
- 10.1103/PhysRevB.63.174506
- arXiv:
- arXiv:cond-mat/0011148
- Bibcode:
- 2001PhRvB..63q4506G
- Keywords:
-
- 74.40.+k;
- 74.76.-w;
- 74.25.Fy;
- Fluctuations;
- Transport properties;
- Condensed Matter - Superconductivity
- E-Print:
- 12 pages, 4 figures, submitted to Phys. Rev. B