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Shishido, T.
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article
Thermal conductivity of layered borides
Abstract
<p>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 aluminoborides to the effect of so-called "building defects." In this paper, we report data for the effect of building defects on the thermal conductivities of α-TmAlB<sub>4</sub> single crystals. Building defects reduce the thermal conductivity of α-TmAlB<sub>4</sub> by ≈30%. At room temperature, the thermal conductivity of AlB<sub>2</sub> is nearly a factor of 5 higher than that of α-TmAlB<sub>4</sub>. AlB<sub>2</sub> 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<sub>2</sub> with electrons being the dominant heat carriers.</p>