APS » PROLA » Phys. Rev. B » Volume 64 » Issue 17

Phys. Rev. B 64, 172404 (2001) [4 pages]

Spin-Peierls fluctuations in (TMTTF)2Br studied by pulsed electron spin resonance spin-lattice relaxation

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A. Zorko1, D. Arčon1, K. Biljaković2, C. Carcel3, J. M. Fabre3, and J. Dolinšek1
1Jozef Stefan Institute, University of Ljubljana, Jamova 39, SI-1000 Ljubljana, Slovenia
2Institute of Physics, Bijenička 46, P.O. Box 304, HR-10001 Zagreb, Croatia
3Laboratoire d’Hétérochimie et des Matériaux Organiques, UMR-5076, ENSCM, 8, Rue de l’École Normale, F-34296 Montpellier Cedex 5, France

Received 8 March 2001; revised 25 May 2001; published 3 October 2001

Spin-Peierls lattice fluctuations were studied in the paramagnetic phase of the antiferromagnetic compound (TMTTF)2Br by pulsed electron spin resonance spin-lattice relaxation experiment. The relaxation via long-wavelength acoustic phonons was found to coexist with the relaxation via spin fluctuations, becoming the dominant relaxation mechanism in the temperature interval between about 50 K and just above the antiferromagnetic phase transition. This gives direct evidence on the presence of long-wavelength lattice fluctuations in the investigated temperature range.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v64/e172404
DOI: 10.1103/PhysRevB.64.172404
PACS: 75.50.Ee, 61.82.Pv, 76.30.-v

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