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TT: Fachverband Tiefe Temperaturen
TT 33: Symposium: High-Temperature Superconductivity
TT 33.13: Talk
Thursday, February 28, 2008, 18:40–19:10, H 0104
Indications on fluctuation origin of the recently observed giant Nernst effect in superconductors above Tc — •A.A. Varlamov — COHERENTIA-INFM, CNR, Rome, Italy
There are two types of fluctuation corrections: the first, like conductivity, have to be compared with the corresponding value of the normal state, the second, like fluctuation magnetization, reflect appearance of principally new quality and have to be compare with the anomalous diamagnetism of superconducting phase. I will show that the Nernst signal belongs to the effects of the second type. Both GL phenomenology and microscopic analysis indicate that Nernst effect, negligible in normal metal manifests itself by giant fluctuations along the line Tc(H).