Reduced Thermal Conductivity and Strong Electron–Phonon Interactions in Enhanced Pauli Paramagnets AOs4Sb12 (A=Sr, Ba)

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  • Matsuoka Eiichi
    Department of Quantum Matter, ADSM, Hiroshima University
  • Narazu Shouta
    Department of Quantum Matter, ADSM, Hiroshima University
  • Hayashi Katsuyuki
    Department of Quantum Matter, ADSM, Hiroshima University
  • Umeo Kazunori
    Department of Quantum Matter, ADSM, Hiroshima University
  • Takabatake Toshiro
    Department of Quantum Matter, ADSM, Hiroshima University Institute for Advanced Materials Research, Hiroshima University

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  • Reduced Thermal Conductivity and Strong Electron–Phonon Interactions in Enhanced Pauli Paramagnets AOs<sub>4</sub>Sb<sub>12</sub>(A=Sr, Ba)

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Abstract

The magnetic, transport and thermal properties of alkaline-earth-filled skutterudites AOs4Sb12 (A=Sr, Ba) are reported. The strong temperature dependence of the magnetic susceptibility and the moderately high value of the temperature linear coefficient of specific heat [45 mJ/(mol K2)] indicate the presence of a large density of states derived from Os 5d states near the Fermi level. The lattice thermal conductivity κph does not show a peak near 50 K and its value is much smaller than those of the Fe- and Ru-counterparts. This unusual behavior of κph is attributed to the phonon scattering by localized vibrations of A2+ ions in the oversized cage of Os4Sb12. We propose that the strong electron–phonon interaction in the presence of tunneling states is the origin for the shoulder observed in the electrical resistivity around 100 K.

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