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arXiv · 1302.6739

Specific heat and thermal conductivity of ferromagnetic magnons in Yttrium Iron Garnet

B. Y. Pan·T. Y. Guan·X. C. Hong·S. Y. Zhou·X. Qiu·H. Zhang·S. Y. Li
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Abstract

The specific heat and thermal conductivity of the insulating ferrimagnet Y$_3$Fe$_5$O$_{12}$ (Yttrium Iron Garnet, YIG) single crystal were measured down to 50 mK. The ferromagnetic magnon specific heat $C$$_m$ shows a characteristic $T^{1.5}$ dependence down to 0.77 K. Below 0.77 K, a downward deviation is observed, which is attributed to the magnetic dipole-dipole interaction with typical magnitude of 10$^{-4}$ eV. The ferromagnetic magnon thermal conductivity $κ_m$ does not show the characteristic $T^2$ dependence below 0.8 K. To fit the $κ_m$ data, both magnetic defect scattering effect and dipole-dipole interaction are taken into account. These results complete our understanding of the thermodynamic and thermal transport properties of the low-lying ferromagnetic magnons.

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B. Y. Pan, T. Y. Guan, X. C. Hong, S. Y. Zhou, X. Qiu, H. Zhang, S. Y. Li. 2013-02-27. Specific heat and thermal conductivity of ferromagnetic magnons in Yttrium Iron Garnet. https://doi.org/10.1209/0295-5075%2F103%2F37005

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