Low lattice-thermal conductivity in a cage-structured compound YbCu9Sn4 with divalent Yb ions

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Abstract Polycrystalline sample of YbCu 9 Sn 4 has been prepared and the physical properties have been investigated. Magnetic susceptibility shows a weak diamagnetism, indicating the Yb ions are in the nonmagnetic Yb 2+ state. Electrical resistivity shows a normal metallic behavior and Seebeck coefficient is as small as the order of 1 μV/K. Specific heat reveals the prominent contribution of Einstein mode at low temperature with the Einstein temperature of 67 K. Lattice thermal conductivity is found to be as small as 2.7 W/Km below room temperature. These results demonstrate that the Yb ions inside the Cu–Sn cage exhibit rattling, which reduces the lattice thermal conductivity of YbCu 9 Sn 4 .

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