Nernst Effect and Anomalous Transport in Cuprates: A Preformed-Pair Alternative to the Vortex Scenario
Abstract
We address those puzzling experiments in underdoped high Tc superconductors which have been associated with normal state "vortices" and show these data can be understood as deriving from preformed pairs with onset temperature T* > Tc. For uncorrelated bosons in small magnetic fields, and arbitrary T*/Tc, we present the exact contribution to all transport coefficients. In the overdoped regime our results reduce to those of standard fluctuation theories (T*≈ Tc). Semi-quantitative agreement with Nernst, ac conductivity and diamagnetic measurements is quite reasonable.
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