Reduction of ordered moment and Neel temperature of quasi one-dimensional antiferromagnets Sr2CuO3 and Ca2CuO3
K. M. Kojima, Y. Fudamoto, M. Larkin, G. M. Luke, J. Merrin, B., Nachumi, Y. J. Uemura, N. Motoyama, H. Eisaki, S. Uchida, K. Yamada, Y., Endoh, S. Hosoya, B. J. Sternlieb, and G. Shirane
TL;DR
This study investigates how the ordered magnetic moment and Neel temperature decrease in quasi-one-dimensional antiferromagnets Sr2CuO3 and Ca2CuO3, revealing a continuous reduction linked to inter-chain interactions.
Contribution
It provides experimental evidence of the reduction of ordered moments and Neel temperature in quasi-1D antiferromagnets, highlighting the scaling relationship between moment size and Neel temperature.
Findings
Ordered moment size in Sr2CuO3 is ~0.06 μB.
The ratio of moments in Ca2CuO3 to Sr2CuO3 is approximately 1.5.
The reduction in ordered moment correlates with decreasing Neel temperature.
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 \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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