Nernst effect and anomalous transport in cuprates: A preformed-pair alternative to the vortex scenario
Shina Tan, K. Levin
DOI 10.1103/PhysRevB.69.064510 · Physical Review B
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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). Semiquantitative agreement with Nernst, ac and dc conductivity, and diamagnetic measurements is quite reasonable.
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