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; M. Hoinkis; M. Sing; M. Klemm; S. Horn; R. Claessen

doi:10.1103/PhysRevB.75.094404

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

Strongly Correlated Electrons 2010-07-08 v1

Authors: P. J. Baker , S. J. Blundell , F. L. Pratt , T. Lancaster , M. L. Brooks , W. Hayes , M. Isobe , Y. Ueda , M. Hoinkis , M. Sing , M. Klemm , S. Horn , R. Claessen

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Abstract

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.

Keywords

muon spin relaxation spin gap dimerized spin-1/2 chains orbital ordering magnetic susceptibility Ti3+ chain compounds

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@article{arxiv.cond-mat/0610272,
  title  = {Muon-spin relaxation measurements on the dimerized spin-1/2 chains NaTiSi2O6 and TiOCl},
  author = {P. J. Baker and S. J. Blundell and F. L. Pratt and T. Lancaster and M. L. Brooks and W. Hayes and M. Isobe and Y. Ueda and M. Hoinkis and M. Sing and M. Klemm and S. Horn and R. Claessen},
  journal= {arXiv preprint arXiv:cond-mat/0610272},
  year   = {2010}
}

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4 pages, 3 figures

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

Abstract

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