Site-dilution in the quasi-one-dimensional antiferromagnetSr2(Cu1−xPdx)O3: Reduction of Néel temperature and spatial distribution of ordered moment sizes Academic Article uri icon

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abstract

  • We investigate the Neel 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 (muSR) technique. The Neel 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 Neel temperature is compared with a recent theoretical study (S. Eggert, I. Affleck and M.D.P. Horton, Phys. Rev. Lett. 89, 47202 (2002)) of weakly coupled one-dimensional antiferromagnetic chains of S=1/2 spins, and a quantitative agreement is found. The inhomogeneity of the ordered moment sizes is characterized by the muSR time spectra. We propose a model that the ordered moment size recovers away from the dopant S=0 sites with a recovery length of \xi = 150-200 sites. The origin of the finite recovery length \xi for the gapless S=1/2 antiferromagnetic chain is compared to the estimate based on the effective staggered magnetic field from the neighboring chains.

authors

  • Kojima, KM
  • Yamanobe, J
  • Eisaki, H
  • Uchida, S
  • Fudamoto, Y
  • Gat, IM
  • Larkin, MI
  • Savici, A
  • Uemura, YJ
  • Kyriakou, PP
  • Rovers, MT
  • Luke, Graeme

publication date

  • September 1, 2004