Volume 66, Number 4, May 2004
|Page(s)||579 - 584|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 May 2004|
Phase coherence and the Nernst effect at magic angles in organic conductors
Department of Physics, Princeton University - Princeton, NJ 08544, USA
Accepted: 17 March 2004
A giant Nernst signal was recently observed for fields near crystallographic directions in . Such large Nernst signals are most naturally associated with the motion of pancake vortices. We propose a model in which phase coherence is destroyed throughout the sample except in planes closely aligned with the applied field . A small tilt above or below the plane changes the direction and density of the penetrating vortices and leads to a Nernst signal that varies with the tilt angle of as observed. The resistance notches at magic angles are understood in terms of flux-flow dissipation from field-induced vortices.
PACS: 74.20.-z – Theories and models of superconducting state / 74.70.Kn – Organic superconductors / 72.15.Jf – Thermoelectric and thermomagnetic effects
© EDP Sciences, 2004
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