Muon study of the spin dynamics in the organic spin-Peierls compound MEM(TCNQ) 2

• Published in: Synthetic metals Vol. 103; no. 1; pp. 2034 - 2037
• Main Authors: Lovett, B.W., Blundell, S.J., Jestädt, Th, Pratt, F.L., Kurmoo, M., Tagaki, S., Hayes, W.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 01-06-1999; Amsterdam Elsevier Science; New York, NY
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical-point effects, specific heats, short-range order; Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.); Exact sciences and technology; Magnetic phase transitions; Magnetic properties and materials; Magnetic resonances and relaxations in condensed matter, mössbauer effect; metal-insulator phase transitions; muon spin relaxation; Muon spin rotation and relaxation; Physics; structural phase transitions; Magnetic phase transitions; structural phase transitions; metal-insulator phase transitions; muon spin relaxation; Muon spin relaxation; Spin Peierls transition; Temperature dependence; Experimental study; Organic conductors; Magnetic susceptibility
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/S0379-6779(98)00294-X

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 spin singlet state.