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arxiv cond-mat/0610272 v1 pith:YGHQWUWK submitted 2006-10-10 cond-mat.str-el

Muon-spin relaxation measurements on the dimerized spin-1/2 chains NaTiSi2O6 and TiOCl

P.J. Baker , S.J. Blundell , F.L. Pratt , T. Lancaster , M.L. Brooks , W. Hayes , M. Isobe , Y. Ueda
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M. Hoinkis M. Sing M. Klemm S. Horn R. Claessen
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classification cond-mat.str-el
keywords spinnatisi2o6relaxationtiocldeltafluctuationsmagneticmuon
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We report muon spin relaxation (muSR) and magnetic susceptibility investigations of two Ti3+ chain compounds which each exhibit a spin gap at low temperature, NaTiSi2O6 and TiOCl. From these we conclude that the spin gap in NaTiSi2O6 is temperature independent, with a value of 2*Delta=660(50)K, arising from orbital ordering at Too = 210K; the associated structural fluctuations activate the muon spin relaxation rate up to temperatures above 270K. In TiOCl we find thermally activated spin fluctuations corresponding to a spin gap 2*Delta=420(40)K below Tc1=67K. We also compare the methods used to extract the spin gap and the concentration of free spins within the samples from muSR and magnetic susceptibility data.

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