The low-temperature electron spin resonance (ESR) spectra and the static magnetization data obtained for the stoichiometric single crystals of β-Na0.33V2O5 indicate that this quasi-one-dimensional mixed valence (V4+/V5+) compound demonstrates at TN=22 K the phase transition into the canted antiferromagnetically ordered state. The spontaneous magnetization of 3.4×10−3μB per V4+ ion was found to be oriented along the two-fold b axis of the monoclinic structure, the vector of antiferromagnetism is aligned with the a axis and the Dzyaloshinsky vector is parallel to the c-axis. The experimental data were successfully described in the frame of the macroscopic spin dynamics and the following values for the macroscopic parameters of the spin system were obtained: the Dzyaloshinsky field HD=6 kOe, the energy gaps of two branches of the spin wave spectrum Δ1=48 GHz and Δ2=24 GHz.
@article{arxiv.cond-mat/0012434,
title = {The magnetic ordering in the mixed valence compound beta-Na0.33V2O5},
author = {A. N. Vasil'ev and V. I. Marchenko and A. I. Smirnov and S. S. Sosin and H. Yamada and Y. Ueda},
journal= {arXiv preprint arXiv:cond-mat/0012434},
year = {2009}
}