Thermal conductivity of layered borides: The effect of building defects on the 
thermal conductivity of TmAlB4 and the anisotropic thermal conductivity of AlB2

Wang, X.J.; Mori, T.; Kuzmych-Ianchuk, I.; Michiue, Y.; Yubuta, K.; Shishido, T.; Grin, Y.; Okada, S.; Cahill, D.G.

doi:10.1063/1.4871797

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Thermal conductivity of layered borides: The effect of building defects on the thermal conductivity of TmAlB₄ and the anisotropic thermal conductivity of AlB₂

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Grin, Y.
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Wang, X., Mori, T., Kuzmych-Ianchuk, I., Michiue, Y., Yubuta, K., Shishido, T., et al. (2014). Thermal conductivity of layered borides: The effect of building defects on the thermal conductivity of TmAlB₄ and the anisotropic thermal conductivity of AlB₂. APL Materials, 2(4): 046113, pp. 1-6. doi:10.1063/1.4871797.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-80C9-C

Abstract

Rare earth metal borides have attracted great interest due to their unusual properties, such as superconductivity and f-electron magnetism. A recent discovery attributes the tunability of magnetism in rare earth alumino borides to the effect of so-called ldquobuilding defects.rdquo In this paper, we report data for the effect of building defects on the thermal conductivities of alpha-TmAlB 4 single crystals. Building defects reduce the thermal conductivity of alpha-TmAlB 4 by ap30%. At room temperature, the thermal conductivity of AlB 2 is nearly a factor of 5 higher than that of alpha-TmAlB 4. AlB 2 single crystals are thermally anisotropic with the c-axis thermal conductivity nearly twice the thermal conductivity of the a-b plane. Temperature dependence of the thermal conductivity near and above room temperature reveals that both electrons and phonons contribute substantially to thermal transport in AlB 2 with electrons being the dominant heat carriers.