77Se NMR probe of magnetic excitations of the magic angle effect in (TMTSF)2PF6 -: art. no. 097004

We report Se-77 spin-lattice relaxation rates for (TMTSF)(2)PF6, carried out in the regime where a set of spectacular transport anomalies known as the magic angle effects are observed. In situ resistance measurements (R-zz) were used to verify the experimental conditions and give precise sample alignment information. We found that the Se-77 T-1(-1) 1 exhibits no significant changes as the magnetic-field orientation is rotated through the magic angles, and conclude that there is no evidence for either a single-particle gap or a spin gap. The clearly observed field-induced spin-density wave transition temperature is also, unexpectedly, not enhanced at the magic angles.