Atomic Physics Seminars

Special CM Seminar
Monday, February 14, 2005
3:30 PM
Physics Building, Room 204
Note special time.

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"The Nernst Effect in High-temperature Superconductors"

Iddo Ussishkin , Minnesota
[Host: Paul Fendley]
One of the puzzles of high-temperature superconductivity concerns the nature of the non-superconducting state above the critical temperature T_c. Recently, a measurement of the Nernst effect, a transverse thermoelectric response, revealed an anomalously large Nernst signal above T_c which is very different from that observed in conventional materials. In this talk, I discuss the theory of the Nernst effect in the cuprates. I will argue that at least in a part of the phase diagram, corresponding to the overdoped cuprates, the puzzle can be explained within the theory of superconducting fluctuations. For the underdoped case, I will consider the limitations set by the Nernst effect measurements on possible theoretical scenarios.

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