Abstract
The interaction of parallel conducting perylene and insulating spin-1/2 $[\text{Pt}{(mnt)}_{2}]$ molecular chains in ${(Per)}_{2}{[\text{Pt}(mnt)}_{2}$] is investigated through the magnetic field dependence of their coupled Peierls (charge density wave - CDW) and spin-Peierls (SP) ground states. Proton NMR is used to monitor the spin-chain behavior, and signatures in the NMR spectrum and spin-relaxation rate are compared with previous electrical transport measurements that describe the metal-insulator transition in the perylene chains associated with the CDW phase boundary. We find that the SP and CDW chains remain coupled to high fields, at variance with a simple mean-field description, and that symmetry breaking in the perylene CDW transition may drive the nearly simultaneous SP transition.
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