Superconducting fluctuations at low temperature
Abstract
The effect of fluctuations on the transport and thermodynamic properties of twodimensional superconductors in a perpendicular magnetic field is studied at low temperature T<<T_{c0}. 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 AslamazovLarkin, MakiThompson, and density of states contributions are of the same order. At extremely low temperature T/T_{c0}<<[HH_{c2}(0)]/H_{c2}(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[HH_{c2}(0)]. In the nonlocal clean limit, the AslamazovLarkin contribution to conductivity is evaluated with the aid of HelfandWerthamer theory. The longitudinal and Hall conductivities are found. The fluctuating magnetization is calculated in the oneloop and twoloop approximations.
 Publication:

Physical Review B
 Pub Date:
 May 2001
 DOI:
 10.1103/PhysRevB.63.174506
 arXiv:
 arXiv:condmat/0011148
 Bibcode:
 2001PhRvB..63q4506G
 Keywords:

 74.40.+k;
 74.76.w;
 74.25.Fy;
 Fluctuations;
 Transport properties;
 Condensed Matter  Superconductivity
 EPrint:
 12 pages, 4 figures, submitted to Phys. Rev. B