Quasielastic Raman scattering arising from spin energy fluctuations is used to extract the magnetic specific heat. To test the applicability of a Raman scattering technique for probing magnetic specific heat, we choose three different classes of quantum magnets: (i) a quasi-1D s = 1/2 antiferromagnetic chain CuSe₂O₅, (ii) a 3D Kitaev honeycomb magnet γ-Li₂IrO₃, and (iii) a coupled-spin tetrahedral system Cu₂Te₂O₅Cl₂. Despite distinct dimensionality, spin topology, and spin-exchange type, the three materials show a pronounced quasielastic response commonly, enabling the determination of the magnetic contributions to the specific heat. Our work demonstrates that a Raman spectroscopic method is useful, complementing the conventional thermodynamic method, in deriving the magnetic specific heat in quantum magnets.

中文翻译：

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量子磁体中磁比热的拉曼光谱探针

由自旋能量波动引起的准弹性拉曼散射被用于提取磁比热。为了测试拉曼散射技术探测磁性比热的适用性，我们选择了三种不同类别的量子磁体：（i）准1D s = 1/2反铁磁链CuSe ₂ O ₅，（ii）3D Kitaev蜂窝磁铁γ-栗₂的IrO ₃，和（iii）一个耦合自旋四面体系统的Cu ₂碲₂ ö ₅氯₂。尽管具有不同的尺寸，自旋拓扑和自旋交换类型，这三种材料通常显示出明显的准弹性响应，从而能够确定对比热的磁性贡献。我们的工作表明，拉曼光谱法在推导量子磁体中的磁比热方面是有用的，是对传统热力学方法的补充。