论文标题
拓扑磁铁cu $ _3 $ teo $ _6 $的磁成功耦合的证据
Evidence for magnon-phonon coupling in the topological magnet Cu$_3$TeO$_6$
论文作者
论文摘要
我们执行热力学和非弹性中子散射（INS）测量值，以研究立方共线抗抗铁的晶格动力（Phonon）（声子），该抗Fiferromagnet Cu $ _3 $ teo $ _6 $ hostots Hostots Hostots Hostote Hostote Hostote Hostote teo $ _6 $。虽然特定的热量和热导率结果表明，热传输是由声子主导的，但导热率与纯音调模型的偏差表明磁子和声子之间存在很强的耦合。在INS测量值中，我们在4.5 K处的激发光谱中找到了一种模式，该模式在布里渊区中心周围表现出略有向下的分散。该模式消失在Néel温度之上，因此不能是声子。此外，色散与镁的色散不同。取而代之的是，它可以通过镁抛光模式来解释，这是由磁子和声子之间的杂交产生的新集体激发。我们认为抑制了镁 - 波隆模式的导热率和出现，作为Cu $ _3 $ _3 $ teo $ _6 $的磁成功耦合的证据。
We perform thermodynamic and inelastic neutron scattering (INS) measurements to study the lattice dynamics (phonons) of a cubic collinear antiferromagnet Cu$_3$TeO$_6$ which hosts topological spin excitations (magnons). While the specific heat and thermal conductivity results show that the thermal transport is dominated by phonons, the deviation of the thermal conductivity from a pure phononic model indicates that there is a strong coupling between magnons and phonons. In the INS measurements, we find a mode in the excitation spectra at 4.5 K, which exhibits a slight downward dispersion around the Brillouin zone center. This mode disappears above the Néel temperature, and thus cannot be a phonon. Furthermore, the dispersion is distinct from that of a magnon. Instead, it can be explained by the magnon-polaron mode, which is new collective excitations resulting from the hybridization between magnons and phonons. We consider the suppression of the thermal conductivity and emergence of the magnon-polaron mode to be evidence for magnon-phonon coupling in Cu$_3$TeO$_6$.
