Phononic thermal Hall effect in diluted terbium oxides
Phononic thermal Hall effect in diluted terbium oxides
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DOI：
10.1103/physrevb.99.134419
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发表时间：
2019-04-11
影响因子：
3.7
通讯作者：
Onose, Yoshinori
中科院分区：
文献类型：
--
作者：
Hirokane, Yuji;Nii, Yoichi;Onose, Yoshinori
我们观察到了(Tb0.3Y0.7)(2)Ti2O7的热霍尔电导率，这比之前观察到的Tb2Ti2O7的热霍尔电导率还要大[科学348,106(2015)]。对Tb磁矩稀释的稳健性表明，声子的霍尔效应是Tb焦绿石氧化物热霍尔电导的来源。温度和磁场的依赖关系遵循霍尔角与磁化强度成正比的经验关系。我们还研究了(Tb0.3Y0.7)(3)Ga5O12的热霍尔电导。我们在低温下观察到的热导率几乎是有限的。这证实了Tb-石榴石氧化物的热霍尔导电性。与前人提出的声子霍尔效应理论进行了比较，讨论了焦绿石系统中经验关系的来源以及两个系统之间的大小差异。
We observe thermal Hall conductivity for (Tb0.3Y0.7)(2)Ti2O7, which is even larger than the previously observed thermal Hall conductivity for Tb2Ti2O7 [Science 348, 106 (2015)]. The robustness against the dilution of the Tb magnetic moment indicates the Hall effect of phonons is the origin of thermal Hall conductivity in Tb pyrochlore oxide. The temperature and magnetic field dependences are observed to follow the empirical relation that the Hall angle is proportional to the magnetization. We also investigate thermal Hall conductivity for (Tb0.3Y0.7)(3)Ga5O12. We observe barely finite thermal conductivity at low temperatures. This confirms the thermal Hall conductivity in Tb-garnet oxide. The origins of the empirical relation in the pyrochlore system and the magnitude difference between the two systems are discussed comparatively with previously proposed theories of the phonon Hall effect.