Observation of higher-harmonic helical spin-resonance modes in the chromium spinel CdCr2O4.
Observation of higher-harmonic helical spin-resonance modes in the chromium spinel CdCr2O4.
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DOI：
10.1103/physrevlett.97.257202
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发表时间：
2006-12
影响因子：
8.6
通讯作者：
S. Kimura;M. Hagiwara;H. Ueda;Y. Narumi;K. Kindo;H. Yashiro;T. Kashiwagi;H. Takagi
中科院分区：
文献类型：
--
作者：
S. Kimura;M. Hagiwara;H. Ueda;Y. Narumi;K. Kindo;H. Yashiro;T. Kashiwagi;H. Takagi
对铬尖晶石化合物CdCr_2O_4进行了高频ESR测量。在Hc'约5.7T以下观察到的ESR模式可以很好地解释基于假设螺旋自旋结构的分子场理论计算的共振模式。除了基模外，我们还首次成功地观测到了高次谐波模。ESR模在H_c ′以上的大变化表明，在H_c ′附近自旋结构发生了从螺旋结构到四亚晶格倾斜结构的变化。
High frequency ESR measurements on the chromium spinel compound CdCr2O4 have been performed. The observed ESR modes below Hc' approximately 5.7 T can be explained well by the calculated resonance modes based on a molecular field theory assuming a helical spin structure. Other than the fundamental ones, we have succeeded in observing the higher-harmonic modes for the first time. A large change of the ESR modes above Hc' indicate that a variation of the spin structure from the helical to the four-sublattice canted one takes place around Hc'.