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Phys. Rev. Lett. 78, 1787–1790 (1997)

Reduction of Ordered Moment and Néel Temperature of Quasi-One-Dimensional Antiferromagnets Sr2CuO3 and Ca2CuO3

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K. M. Kojima1, Y. Fudamoto1, M. Larkin1, G. M. Luke1, J. Merrin1, B. Nachumi1, Y. J. Uemura1, N. Motoyama2, H. Eisaki2, S. Uchida2, K. Yamada3, Y. Endoh3, S. Hosoya4, B. J. Sternlieb5, and G. Shirane5
1Department of Physics, Columbia University, New York, New York 10027
2Department of Applied Physics, University of Tokyo, Tokyo 113, Japan
3Department of Physics, Tohoku University, Sendai 980-77, Japan
4Institute of Inorganic Synthesis, Yamanashi University, Kofu 400, Japan
5Brookhaven National Laboratory, Upton, New York 11973-5000

Received 10 October 1996; published in the issue dated 3 March 1997

We report elastic neutron diffraction and muon spin relaxation ( μSR) 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 ∼0.06μB. We find that the ratio of ordered moment size μ(Ca2CuO3)/μ(Sr2CuO3) = 1.5(1) roughly scales with their Néel temperatures, which suggests that the ordered moment size of quasi-one-dimensional antiferromagnets decreases continuously in the limit of vanishing interchain interactions.

© 1997 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.1787
DOI:
10.1103/PhysRevLett.78.1787
PACS:
75.25.+z, 75.10.Jm, 76.75.+i
 
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