Dy $_2$ Ti $_2$ O PDMATHAAB和Ho $_2$ Ti $_2$ O $_7$平衡态和非平衡态的超声研究
Ultrasonic investigations of spin-ices Dy$_2$Ti$_2$O$_7$ and Ho$_2$Ti$_2$O$_7$ in and out of equilibrium
摘要：
我们报告自旋冰材料Dy $_2$ Ti $_2$ O $_7$（DTO）和Ho $_2$ Ti $_2$ O $_7$（HTO）中的自旋晶格和单离子效应的超声研究，涵盖相变，与低能磁激发的相互作用，以及单离子效应。特别是，在DTO的磁单极子的气-液过渡的声音衰减中观察到的急剧下降解释的基础上，涉及负弛豫过程的方法。此外，准周期性峰值的声学性质的DTO由于非平衡过程被发现受到强烈的影响{ \em宏观}的热耦合条件：在DTO的热失控在以前的研究中观察到的可以被完全抑制浸没在液氦中的样品。晶体电场效应具有更高的能量标度导致重整化的声速和声衰减在非常高的磁场。我们分析我们的观察使用的方法的基础上分析的交换-伸缩耦合和单离子效应。
英文摘要：
We report ultrasound studies of spin-lattice and single-ion effects in the spin-ice materials Dy$_2$Ti$_2$O$_7$ (DTO) and Ho$_2$Ti$_2$O$_7$ (HTO) across a broad field range up to 60 T, covering phase transformations, interactions with low-energy magnetic excitations, as well as single-ion effects. In particular, a sharp dip observed in the sound attenuation in DTO at the gas-liquid transition of the magnetic monopoles is explained based on an approach involving negative relaxation processes. Furthermore, quasi-periodic peaks in the acoustic properties of DTO due to non-equilibrium processes are found to be strongly affected by {\em macroscopic} thermal-coupling conditions: the thermal runaway observed in previous studies in DTO can be suppressed altogether by immersing the sample in liquid helium. Crystal-electric-field effects having higher energy scale lead to a renormalization of the sound velocity and sound attenuation at very high magnetic fields. We analyze our observations using an approach based on an analysis of exchange-striction couplings and single-ion effects.
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