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

Abstract

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 μ(Ca2CuO3)/μ(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.

4 pages, 4 figures

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• Dynamics of coupled quantum spin chains
• A Plane of Weakly Coupled Heisenberg Chains: Theoretical Arguments and Numerical Calculations
• Realization of a Spin liquid in a Two Dimensional Quantum Antiferromagnet

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