Low-temperature thermal conductivity of terbium-gallium garnet

被引：0
作者：
A. V. Inyushkin
A. N. Taldenkov
机构：
[1] Kurchatov Institute,Russian Research Centre
来源：
Journal of Experimental and Theoretical Physics | 2010年 / 111卷
关键词：
Thermal Conductivity; Angular Dependence; Terbium; Phonon Scattering; Thermal Conductivity Measurement;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Thermal conductivity of paramagnetic Tb3Ga5O12 (TbGG) terbium-gallium garnet single crystals is investigated at temperatures from 0.4 to 300 K in magnetic fields up to 3.25 T. A minimum is observed in the temperature dependence κ(T) of thermal conductivity at Tmin = 0.52 K. This and other singularities on the κ(T) dependence are associated with scattering of phonons from terbium ions. The thermal conductivity at T = 5.1 K strongly depends on the magnetic field direction relative to the crystallographic axes of the crystal. Experimental data are considered using the Debye theory of thermal conductivity taking into account resonance scattering of phonons from Tb3+ ions. Analysis of the temperature and field dependences of the thermal conductivity indicates the existence of a strong spin-phonon interaction in TbGG. The low-temperature behavior of the thermal conductivity (field and angular dependences) is mainly determined by resonance scattering of phonons at the first quasi-doublet of the electron spectrum of Tb3+ ion.
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页码：760 / 769
页数：9
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