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Reduction of ordered moment and Neel temperature of quasi one-dimensional antiferromagnets Sr2CuO3 and Ca2CuO3

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arxiv cond-mat/9701091 v1 pith:K7G4J5TW submitted 1997-01-14 cond-mat.str-el

K. M. Kojima , Y. Fudamoto , M. Larkin , G. M. Luke , J. Merrin , B. Nachumi , Y. J. Uemura , N. Motoyama
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H. Eisaki S. Uchida K. Yamada Y. Endoh S. Hosoya B. J. Sternlieb G. Shirane
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classification cond-mat.str-el
keywords momentorderedsr2cuo3antiferromagnetsca2cuo3one-dimensionalquasisize
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We report elastic neutron diffraction and muon spin relaxation (muSR) measurements of the quasi one-dimensional antiferromagnets Sr2CuO3 and Ca2CuO3, which have extraordinarily reduced TN/J ratios. We observe almost resolution-limited antiferromagnetic Bragg reflections in Sr2CuO3 and obtain a reduced ordered moment size of ~0.06 \muB. We find that the ratio of ordered moment size \mu(Ca2CuO3)/\mu(Sr2CuO3)=1.5(1) roughly scales with their Neel temperatures, which suggests that the ordered moment size of quasi one-dimensional antiferromagnets decreases continuously in the limit of vanishing inter-chain interactions.

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