Km. Kojima et al., REDUCTION OF ORDERED MOMENT AND NEEL TEMPERATURE OF QUASI-ONE-DIMENSIONAL ANTIFERROMAGNETS SR2CUO3 AND CA2CUO3, Physical review letters, 78(9), 1997, pp. 1787-1790
We report elastic neutron diffraction and muon spin relaxation (mu SR)
measurements of the quasi-one-dimensional antiferromagnets Sr2CuO3 an
d Ca2CuO3, which have extraordinarily reduced T-N/J ratios. We observe
almost resolution-limited antiferromagnetic Bragg reflections in Sr2C
uO3 and obtain a reduced ordered moment size of similar to 0.06 mu(B).
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 interchain interacti
ons.