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Spin dynamics in the organic spin - Peierls system MEM(TCNQ) studied using muon-spin relaxation

S J Blundell-+, F L Pratt-+, P A Pattenden-+, M Kurmoo++, K H Chow-+, S Takagi§, Th Jestädt-+ and W Hayes-+

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LETTER TO THE EDITOR

We report the first muon-spin relaxation study of an organic spin - Peierls system, the linear-chain compound MEM(TCNQ). Our results show a crossover from a Gaussian relaxation to an exponential relaxation as the temperature is lowered below the spin - Peierls transition. We associate this behaviour with the slowing down of the electronic fluctuations resulting from the opening of a gap in the magnetic excitation spectrum.


PACS

75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)

75.50.Ee Antiferromagnetics

75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)

76.75.+i Muon spin rotation and relaxation

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 9 (3 March 1997)

Received 9 January 1997



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