Phase coherence and the Nernst effect at magic angles in organic conductors

Details Phase coherence and the Nernst effect at magic angles in organic conductors Phase coherence and the Nernst effect at magic angles in organic conductors

2004-01-09

arxiv.org/abs/cond-mat/0401159v1

Europhysics Lett. 66, 579-584 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1209/epl/i2004-10017-9

A giant Nernst signal was recently observed for fields near crystallographic directions in (TMTSF)$_2$PF$_6$. 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 $\bf H$. 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 $\bf H$ as observed. The resistance notches at magic angles are understood in terms of flux-flow dissipation from field-induced vortices.

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