Site-dilution in the quasi-one-dimensional antiferromagnet Sr 2(Cu1-xPdx)O3: Reduction of Néel temperature and spatial distribution of ordered moment sizes

K. M. Kojima, J. Yamanobe, H. Eisaki, S. Uchida, Y. Fudamoto, I. M. Gat, M. I. Larkin, A. Savici, Y. J. Uemura, P. P. Kyriakou, M. T. Rovers, G. M. Luke

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Abstract

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 =5.4 K 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 compared with a recent theoretical study [S. Eggert, I. Affleck, and M. D. P. Horton, Phys. Rev. Lett. 89, 47 202 (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 μSR time spectra. We propose a model that the ordered moment size recovers away from the dopant S=0 sites with a recovery length of ξ ≈ 150-200 sites. The origin of the finite recovery length ξ for the gapless S = 1/2 antiferromagnetic chain is compared to the estimate based on the effective staggered magnetic field from the neighboring chains.

Original languageEnglish
Article number094402
Pages (from-to)094402-1-094402-10
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number9
DOIs
StatePublished - Sep 2004
Externally publishedYes

Funding

The authors would like to thank Dr. S. Eggert and Professor I. Affleck for providing a theory to compare with our experimental result. K.M.K. also would like to thank Dr. S. Eggert for stimulating discussions. Comments from Professor Y. Kato at University of Tokyo were also valuable. The research in this paper has been financially supported by NEDO International Joint Research Grant and by COE & Grant-in-aid for Scientific Research from Monbusho. Work at Columbia University was supported by NSF-DMR-01-02752 and NSF-CHE-01-17752 (Nano-scale Science and Engineering Initiative).

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