Dzyloshinsky-Moriya Interaction Estimated by AFMR of Kagome Like Substance Cu_2O(SO_4)
Dzyloshinsky-Moriya Interaction Estimated by AFMR of Kagome Like Substance Cu_2O(SO_4)
复制标题
Kagome 类物质 Cu_2O(SO_4) 的 AFMR 估计的 Dzyloshinsky-Moriya 相互作用
DOI：
10.1088/1742-6596/400/3/032097
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
H. Kikuchi
中科院分区：
文献类型：
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作者：
N. Takahashi;S. Okubo;H. Ohta;T. Sakurai;M. Fujisawa;H. Kikuchi
白云母Cu 2 O（SO 4）是S= 1/2 kagome类反铁磁体的模型物质之一.虽然人们对天然矿物Cu 2 O（SO 4）的X射线衍射进行了大量的研究，但对它的磁性却知之甚少。因此，在1.8 ~ 86 K的温度范围内，在50 ~ 315 GHz的频率范围内，用16 T的脉冲磁场对黄绿帘石粉末样品进行了多频电子自旋共振（ESR）测量。这与Asano等人先前的磁化率结果一致。此外，1.8 K下的频率-场关系表明具有Dzyaloshinsky-Moriya（DM）相互作用的典型易平面型AFMR，由于DM相互作用的估计对于讨论Cépas等人提出的kagome反铁磁体的量子相变是非常重要的. [2008，Phys. Rev. B 78 140405（R）]，我们从我们的AFMR结果估计DM相互作用的D项为6.98±0.01 K。
Dolerophanite Cu 2 O (SO 4) is one of model substances for S= 1/2 kagome like antiferromagnet. Although many X-ray diffraction studies have been performed on natural mineral Cu 2 O (SO 4), little is known about its magnetic property. Therefore, the multi-frequency electron spin resonance (ESR) measurements of dolerophanite powder sample have been performed using pulsed magnetic fields up to 16 T in the frequency range from 50 GHz to 315 GHz in the temperature range from 1.8 K to 86 K Antiferromagnetic resonance (AFMR) has been observed below T N= 20 K, which is consistent with the previous magnetic susceptibility result by Asano et al. Moreover, the frequency-field relation at 1.8 K suggests typical easy-plane type AFMR with Dzyaloshinsky-Moriya (DM) interaction, which is also consistent with the weak ferromagnetism below T N suggested by Asano et al. As the estimation of DM interaction is very important to discuss the quantum phase transition in kagome antiferromagnet as suggested by Cépas et al.[2008, Phys. Rev. B 78 140405 (R)], we have estimated the D term of DM interaction as 6.98±0.01 K from our AFMR results.