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We investigate the Neel temperature of Sr2CuO3 as a function of the sitedilution at the Cu (S=1/2) sites with Pd (S=0), utilizing the muon spinrelaxation (muSR) technique. The Neel temperature, which is Tn=5.4K for theundoped system, becomes significantly reduced for less than one percent ofdoping Pd, giving a support for the previous proposal for the goodone-dimensionality. The Pd concentration dependence of the Neel temperature iscompared with a recent theoretical study (S. Eggert, I. Affleck and M.D.P.Horton, Phys. Rev. Lett. 89, 47202 (2002)) of weakly coupled one-dimensionalantiferromagnetic chains of S=1/2 spins, and a quantitative agreement is found.The inhomogeneity of the ordered moment sizes is characterized by the muSR timespectra. We propose a model that the ordered moment size recovers away from thedopant S=0 sites with a recovery length of \xi = 150-200 sites. The origin ofthe finite recovery length \xi for the gapless S=1/2 antiferromagnetic chain iscompared to the estimate based on the effective staggered magnetic field fromthe neighboring chains.Comment: 10 pages, 9 figures, submitted to PR

physical review. b, condensed matter and materials physics

Site-dilution in the quasi-one-dimensional antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mo>(</mml:mo><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pd</mml:mi></mml:mrow><mml:mi>x</…

Site-dilution in the quasi-one-dimensional antiferromagnetSr2(Cu1−xPdx