Giant Nernst Effect in (TMTSF)$_2$PF$_6$

ORAL

Abstract

Here we present a detailed study of the Nernst effect in (TMTSF) $_2$PF$_6$, where giant resonant-like Nernst oscillations were found when a magnetic field is aligned with magic angles (inter- chain directions).\footnote{W. Wu et al, PRL 91, 056601 (2003)} The amplitude of Nerst signal is order of 100 $\mu$V/K at H$\sim$7.5T and T$\sim$1K. The Nernst resonance at H//c’ rises gradually as T is lowered, reaches a peak at T$\sim$1K and then falls sharply to zero around 150mK. The Nernst signal is a highly non-linear function of H. This can be partially explained by the large magneto-resistance. The Nernst resonance has a weak pressure dependence. The sign-change of Nernst effect upon rotation through the magic angles suggests that the transport in (TMTSF) $_2$PF$_6$ is effectively coherent only in planes and only when these magic angle planes are parallel to the applied field.

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Authors

  • Weida Wu

    Department of Physics, UT Austin, Department of Physics, University of Texas at Austin, Austin, TX 78723

  • P.M. Chaikin

    Department of Physics, Princeton University, Department of Physics, Princeton University, Princeton, NJ 08544, Physics, Princeton, Princeton University, Princeton Univ., Physics Department, Princeton University, Physics, Princeton University, Physics Dept., Princeton Univ.