Site-dilution in the quasi-one-dimensional antiferromagnet Sr2(Cu1−xPdx)O3: Reduction of Néel temperature and spatial distribution of ordered moment sizes

We investigate the Néel temperature of Sr2CuO3 as a function of the site dilution at the Cu (S=1∕2) sites with Pd (S=0), utilizing the muon spin relaxation (μSR) technique. The Néel temperature, which is TN=5.4K for the undoped system, becomes significantly reduced for less than one percent of doping Pd, giving a support for the previous proposal for the good one-dimensionality. The Pd concentration dependence of the Néel temperature is …