论文标题
磁声四极共振和探测四极杆自由度的应用分析量子磁铁
Analysis of Magnetoacoustic Quadrupole Resonance and Application to Probe Quadrupole Degrees of Freedom in Quantum Magnets
论文作者
论文摘要
由高频超声测量的最新进展激发，我们提出了一种磁声共振理论，作为对磁性材料中隐藏的四极自由度的显微镜探针。由声波耦合驱动的局部应变，通过各种四极型晶体耦合到磁离子的电子状态，这提供了一个定期依赖时间依赖的振荡场。作为典型的两级系统，我们考虑了一个非kramers Doublet，并根据Floquet理论研究了单和多条件介导的过渡过程。过渡概率的分析形式是在弱耦合理论中得出的，这有助于我们分析磁声四极杆的共振。我们将理论应用于OH和D4H对称性中F2配置的现实非kramer DoubleT系统，并讨论如何通过在超声测量中使用施加的磁场来控制四极晶石耦合来识别相关的四极杆。
Motivated by the recent progress of high-frequency ultrasonic measurements, we propose a theory of magnetoacoustic resonance as a microscopic probe for quadrupole degrees of freedom hidden in magnetic materials. A local strain driven by an acoustic wave couples to electronic states of a magnetic ion through various quadrupole-strain couplings, and this provides a periodically time-dependent oscillating field. As a typical two-level system with the quadrupole, we consider a non-Kramers doublet and investigate single- and multiphonon-mediated transition processes on the basis of the Floquet theory. An analytic form of the transition probability is derived within the weak coupling theory, which helps us analyze the magnetoacoustic quadrupole resonance. We apply the theory to realistic non-Kramers doublet systems for the f2 configuration in Oh and D4h symmetries, and discuss how to identify the relevant quadrupole by controlling the quadrupole-strain coupling with an applied magnetic field in ultrasonic measurements.
