Quantum fluctuations and dynamic clustering of fluctuating Cooper pairs
Materials Science Division, Argonne National Laboratory - Argonne, IL 60439, USA
2 CNR-SPIN - Viale del Politecnico 1, I-00133 Rome, Italy, EU
Accepted: 13 April 2011
We derive the complete expression for the fluctuation conductivity in two-dimensional superconductors as a function of the temperature and the magnetic field in the whole fluctuation region above the upper critical field Hc2(T). Focusing on the vicinity of the quantum phase transition near zero temperature, we propose that as the magnetic field approaches the line near Hc2(0) from above, a peculiar dynamic state consisting of clusters of coherently rotating fluctuation Cooper pairs forms and estimate the characteristic size and lifetime of such clusters. We find the zero-temperature magnetic-field dependence of the transverse magnetoconductivity above Hc2(0) in layered superconductors.
PACS: 74.40.-n – Fluctuation phenomena / 74.25.F- – Transport properties / 74.78.-w – Superconducting films and low-dimensional structures
© EPLA, 2011