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arXiv 1407.0802cond-mat.mes-hall
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稀土石榴石中声子霍尔效应的起源

Origin of the Phonon Hall Effect in Rare-Earth Garnets

M. Mori, A. Spencer-Smith, O. P. Sushkov, S. Maekawa

摘要:

在顺磁绝缘体Tb_3Gd_5O_(12)中观察到声子霍尔效应。垂直于热流施加的磁场感应出垂直于磁场和电流的温度梯度。我们发现,这种效应是由于声子从超化学计量Tb^3+离子的晶体场态的共振斜散射。这种散射源于Tb^3+离子的四极矩与晶格应变之间的耦合。估计的效果的大小是一致的,在T=5 K的实验观察,并可以显着提高温度。

英文摘要:

The phonon Hall effect has been observed in the paramagnetic insulator, Tb3Gd5O12. A magnetic field applied perpendicularly to a heat current induces a temperature gradient that is perpendicular to both the field and the current. We show that this effect is due to resonant skew scattering of phonons from the crystal field states of superstoichiometric Tb^3+ ions. This scattering originates from the coupling between the quadrupole moment of Tb^3+ ions and the lattice strain. The estimated magnitude of the effect is consistent with experimental observations at T=5 K, and can be significantly enhanced by increasing temperature.

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