Magnetic excitations probed by $^{77}$Se T$_1$ at Magic angles in (TMTSF)$_2$PF$_6$

ORAL

Abstract

We report $^{77}$Se spin-lattice relaxation T$_1$ measurements of (TMTSF)$_2$PF$_6$ at different field orientations with B=7.3T (f=60MHz) and P=8kbar. We want to see whether T$_1$ changes at the Lebed magic angles and whether the field induced spin density wave (FISDW) critical temperature changes for field applied along the magic angles. Our temperature range was 300mK to 20K. In situ resistance measurements (R$_{zz}$) were used to identify the experimental conditions and give precise sample alignment information. Our T$_1$ data show no significant change as magnetic field is rotated through the magic angles, i.e. no effect in the spin channel. Unexpectedly we also find that the FISDW transition temperature, seen by both T$_1$ and transport (R$_{zz}$) is not enhanced at the magic angles.

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Authors

  • S.E. Brown

    Department of Physics, UCLA

  • Weida Wu

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

  • Jun Shinagawa

    Dept.Phys.and Astro.UCLA, Department of Physics, UCLA

  • 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.