论文标题
低温纵向自旋seebeck效应的理论
Theory of the low-temperature longitudinal spin Seebeck effect
论文作者
论文摘要
使用铁磁绝缘子中耦合自旋和晶格激发的简化微观模型，我们评估了在低温下自旋seebeck效应的磁场依赖性。该模型包括海森贝格交换耦合，谐波晶格电位和伪 - 二色交换相互作用。我们的方法超出了以前的工作[物理学。 Rev. b 98，134421（2018）]，因为它不依赖于对磁子和声子分布的快速平衡的先验假设。我们的理论表明，Kikkawa等人观察到的旋转Seebeck效应的磁场依赖性中的奇异特征。 [物理。莱特牧师。 117，207203（2016）]独立于镁障碍性和声子散射的相对强度。
Using a simplified microscopic model of coupled spin and lattice excitations in a ferromagnetic insulator we evaluate the magnetic-field dependence of the spin Seebeck effect at low temperatures. The model includes Heisenberg exchange coupling, a harmonic lattice potential, and a pseudo-dipolar exchange interaction. Our approach goes beyond previous work [Phys. Rev. B 98, 134421 (2018)] in that it does not rely on the a priori assumption of a fast equilibration of the magnon and phonon distributions. Our theory shows that singular features in the magnetic-field dependence of the spin Seebeck effect at low temperatures observed by Kikkawa et al. [Phys. Rev. Lett. 117, 207203 (2016)] are independent of the relative strength of magnon-impurity and phonon-impurity scattering.
