Superconducting fluctuations at low temperature - art. no. 174506

The effect of fluctuations on the transport and thermodynamic properties of two-dimensional superconductors in a perpendicular magnetic field is studi ed at low temperature T much less thanT(c0). The fluctuation conductivity i s calculated in the framework of perturbation theory with the help of the u sual diagram technique. It is shown that in the dirty case the Aslamazov-La rkin, Maki-Thompson, and density of states contributions are of the same or der. At extremely low temperature T/T-c0 much less than [H - H-c2(O)]/H-c2( 0) the total fluctuation correction to the normal conductivity is negative in the dirty limit and depends on the external magnetic field logarithmical ly delta sigma proportional to ln[H - H-c2(0)]. In the nonlocal clean limit , the Aslamazov-Larkin contribution to conductivity is evaluated with the a id of Helfand-Werthamer theory. The longitudinal and Hall conductivities ar e found. The fluctuating magnetization is calculated in the one-loop and tw o-loop approximations.