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We report a muon spin relaxation study of the organic spin-Peierls system MEM(TCNQ) 2 over the temperature range 39 mK to 200 K. Our results show a crossover from Gaussian to exponential relaxation below the spin-Peierls transition temperature. We attribute this change to the effect of a dilute set of static electronic defect spins resulting from the majority of spins freezing into a non-magnetic...
Examples from the (R 1 ,R 2 -DCNQI) 2 X family of molecular conductors have been studied using μSR in order to provide information about the microscopic magnetic properties of the various phases. For the fully deuterated dimethyl Cu salt (d 8 -DMe-Cu) there is a metal-insulator (MI) transition around 80 K and a magnetic transition around 7 K. The muon spin relaxation...
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