Sound-wave anomalies inSrCu2(BO3)2
Sound-wave anomalies inSrCu2(BO3)2
复制标题
SrCu2(BO3)2 中的声波异常
DOI：
10.1103/physrevb.62.r6097
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发表时间：
2000
影响因子：
3.7
通讯作者：
K. Ueda
中科院分区：
文献类型：
--
作者：
S. Zherlitsyn;S. Schmidt;B. Wolf;H. Schwenk;B. Lüthi;H. Kageyama;K. Onizuka;Y. Ueda;K. Ueda
研究了二维二聚体体系srcu{2}(bo{3}){2}中纵向声波模式c_{11}的温度依赖性和高磁场依赖性。c_{11}(T)由于中间二聚体的强自旋-应变耦合而表现出异常。我们可以用偶联二聚体三联体的分子场近似来定量解释c_{11}(T)与磁化率$\ ch_ {m}(T)$的温度依赖性。当声速达到50T时，在低温磁化平台之间表现出非常明显的软化。我们认为，这些明显的影响是由声子和磁激发之间的共振相互作用引起的，在高原之间表现出软化。
The temperature and high magnetic field dependence of the longitudinal soundwave mode c_{11} in the two dimensional dimer system SrCu_{2}(BO_{3})_{2} is presented. c_{11}(T) shows anomalies due to strong interdimer spin-strain coupling. We can quantitatively interpret the temperature dependence of c_{11}(T) together with the magnetic susceptibility $\chi_{m}(T)$ with a molecular field approximation of coupled dimer triplets. The sound velocity up to 50T shows very sharp softening between the magnetization plateaus at low temperature. We argue that these pronounced effects arise from a resonant interaction between the phonons and the magnetic excitations which show softening between the plateaus.