Magnetic ordering in the mixed-valence compound β − Na 0.33 V 2 O 5
Magnetic ordering in the mixed-valence compound β − Na 0.33 V 2 O 5
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混合价化合物 β − Na 0.33 V 2 O 5 中的磁有序
DOI：
10.1103/physrevb.64.174403
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发表时间：
2000
影响因子：
3.7
通讯作者：
Y. Ueda
中科院分区：
文献类型：
--
作者：
Aleksandr N. Vasil'ev;Vladimir I. Marchenko;Aleksandr I. Smirnov;S. Sosin;H. Yamada;Y. Ueda
化学计量比$\ensuremath{\beta}\ensuremath{-}{\mathrm{Na}}_{0.33}{\mathrm{V}}_{2}{\mathrm{O}}_{5}$单晶的低温电子自旋共振谱和静态磁化强度数据表明，这种准一维混价化合物在{T}{N}=22mathm{K}时发生了向斜置反铁磁有序态的相变.$3.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$的自发磁化强度沿单斜晶系的两重b轴取向，反铁磁性矢量与a轴平行，Dzyaloshinsky矢量与c轴平行。在宏观自旋动力学的框架下成功地描述了实验数据，得到了自旋系统宏观参数的如下数值：Dzyaloshinsky场{H}{D}=6mathm{Koe}以及自旋波谱的两个分支${\ensuremath{\Delta}}_{1}/(2\ensuremath{\pi})=48\mathm{GHz}和${\ensuremath{\Delta}}_{2}/(2\ensuremath{\pi})=24\mathrm{GHz}的能隙。
The low-temperature electron spin resonance (ESR) spectra and the static magnetization data obtained for the stoichiometric single crystals of $\ensuremath{\beta}\ensuremath{-}{\mathrm{Na}}_{0.33}{\mathrm{V}}_{2}{\mathrm{O}}_{5}$ indicate that this quasi-one-dimensional mixed-valence compound demonstrates at ${T}_{N}=22 \mathrm{K}$ the phase transition into the canted antiferromagnetically ordered state. The spontaneous magnetization of $3.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ ${\ensuremath{\mu}}_{B}$ per ${\mathrm{V}}^{4+}$ ion was found to be oriented along the twofold 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 ${H}_{D}=6 \mathrm{kOe}$ and the energy gaps of two branches of the spin wave spectrum ${\ensuremath{\Delta}}_{1}/(2\ensuremath{\pi})=48 \mathrm{GHz}$ and ${\ensuremath{\Delta}}_{2}/(2\ensuremath{\pi})=24 \mathrm{GHz}.$