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We report muon spin relaxation (muSR) and magnetic susceptibilityinvestigations of two Ti3+ chain compounds which each exhibit a spin gap at lowtemperature, NaTiSi2O6 and TiOCl. From these we conclude that the spin gap inNaTiSi2O6 is temperature independent, with a value of 2*Delta=660(50)K, arisingfrom orbital ordering at Too = 210K; the associated structural fluctuationsactivate the muon spin relaxation rate up to temperatures above 270K. In TiOClwe find thermally activated spin fluctuations corresponding to a spin gap2*Delta=420(40)K below Tc1=67K. We also compare the methods used to extract thespin gap and the concentration of free spins within the samples from muSR andmagnetic susceptibility data.Comment: 4 pages, 3 figure

physical review. b, condensed matter and materials physics

Muon-spin relaxation measurements on the dimerized spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>chains<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Na</mml:mi><mml:mi mathvariant="normal">Ti</mml:mi><mml:msub><mml:mi mathvariant="normal">Si</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="…

Muon-spin relaxation measurements on the dimerized spin-1∕2chainsNaTiSi2