High-field electron spin resonance spectroscopy of singlet-triplet transitions in the spin-dimer systems Sr3Cr2O8 and Ba3Cr2O8
High-field electron spin resonance spectroscopy of singlet-triplet transitions in the spin-dimer systems Sr3Cr2O8 and Ba3Cr2O8
复制标题
自旋二聚体系统 Sr3Cr2O8 和 Ba3Cr2O8 中单重态-三重态跃迁的高场电子自旋共振光谱
DOI：
10.1103/physrevb.89.174406
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发表时间：
2014
影响因子：
3.7
通讯作者：
J. Deisenhofer
中科院分区：
文献类型：
--
作者：
Zhe Wang;D. Kamenskyi;O. C'epas;M. Schmidt;D. Quintero;A. Islam;B. Lake;A. Aczel;H. Da̧bkowska;A. Dabkowski;G. Luke;Y. Wan;A. Loidl;M. Ozerov;J. Wosnitza;S. Zvyagin;J. Deisenhofer
通过亚太赫兹频率的高场电子自旋共振探测同构自旋二聚体系统 Sr3Cr2O8 和 Ba3Cr2O8 中的磁激发。观察到三种类型的磁模式。一种模式是无间隙的，对应于激发态内的跃迁，而另外两组模式是有间隙的，对应于从基态到第一激发态的跃迁。根据动态 Dzyaloshinskii-Moriya 相互作用分析了带隙模式的选择规则，表明 Sr3Cr2O8 和 Ba3Cr2O8 的低温自旋动力学中存在声子辅助效应
Magnetic excitations in the isostructural spin-dimer systems Sr3Cr2O8 and Ba3Cr2O8 are probed by means of high-field electron spin resonance at sub-terahertz frequencies. Three types of magnetic modes were observed. One mode is gapless and corresponds to transitions within excited states, while two other sets of modes are gapped and correspond to transitions from the ground to the first excited states. The selection rules of the gapped modes are analyzed in terms of a dynamical Dzyaloshinskii-Moriya interaction, suggesting the presence of phonon-assisted effects in the low-temperature spin dynamics of Sr3Cr2O8 and Ba3Cr2O8