High Field Proton NMR Studies of Single Crystal Per$_{2}$Pt[mnt]$_{2}$

Per$_{2}$Pt[mnt]$_{2}$ is a quasi-one-dimensional organic conductor that has been studied for over thirty years. It consists of perylene and Pt[mnt]$_{2 }$chains that undergo a spin-peierls (SP)-charge density wave (CDW) transition below 8 K. The phase diagram has previously been mapped out up to 42 T using transport measurements. The work we present here is the first single crystal NMR experiment, primarily focusing on the physics of the localized moment present on the platinum site. By measuring relaxation rates and spectra at high fields, up to 26 T, and low temperatures, down to 1.5 K, we were able to map out the SP phase boundary. Preliminary results indicate that the SP transition occurs at a lower temperature than the CDW boundary determined from transport, suggesting that the lattice instability on the perylene drives the dimerization of the platinum moment. Our ultimate goal is to use NMR spectra to observe the platinum moment in the field induced charge density wave (FICDW) state in the range 25-42 T.