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

Abstract

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 $\mathbf{H}$. 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 $\mathbf{H}$ as observed. The resistance notches at magic angles are understood in terms of flux-flow dissipation from field-induced vortices.

4 pages, 4 figures

References in corpus (4)

• The onset of the vortex-like Nernst signal above Tc in La_{2-x}Sr_xCuO_4 and Bi_2Sr_{2-y}La_yCuO_6
• The high-field phase diagram of the cuprates derived from the Nernst effect
• Entropy of vortex cores on the border of the superconductor-to-insulator transition in an underdoped cuprate
• Theory of Thermodynamic Magnetic Oscillations in Quasi-One-Dimensional Conductors

Cited by in corpus (5)

• Interlayer Aharonov-Bohm interference in tilted magnetic fields in quasi-one-dimensional layered conductors
• Giant Angular Dependent Nernst Effect in the Q1D Organic conductor (TMTSF)${}_2$PF${}_6$
• Resonant Nernst effect in the metallic and field-induced spin density wave states of (TMTSF)2ClO4
• Angular magnetoresistance oscillations in quasi-one-dimensional organic conductors in the presence of a crystal superstructure
• Magic angle effects in the interlayer magnetoresistance of quasi-one-dimensional metals due to interchain incoherence