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

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.