Inelastic neutron scattering study of the lattice dynamics of the homologous compounds (PbSe)<sub>5</sub>(Bi<sub>2</sub>Se<sub>3</sub>)<sub>3<i>m</i></sub> (<i>m</i> = 1, 2 and 3) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2018

Inelastic neutron scattering study of the lattice dynamics of the homologous compounds (PbSe)5(Bi2Se3)3m (m = 1, 2 and 3)

Selma Sassi
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Christophe Candolfi
Anne Dauscher
Bertrand Lenoir
Michael Marek Koza

Résumé

We report on the inelastic response of the homologous compounds (PbSe)5(Bi2Se3)3m for m = 1, 2 and 3 followed in a broad temperature range (50 – 500 K) using high-resolution powder inelastic neutron scattering experiments. These results are complemented by low-temperature measurements of the specific heat (2 – 300 K). The evolution of the anisotropic crystal structure of these compounds with varying m, built from alternate Pb-Se and m Bi-Se layers, only weakly influences the generalized phonon density of states. In all the three compounds, intense inelastic signals, likely mainly associated with the dynamics of the Pb atoms, are observed in the 4.5 – 6 meV low-energy range. The response of these low-energy modes to temperature variations indicates a conventional quasi-harmonic behavior over the whole temperature range investigated. The modes located above 8 meV show a minor temperature effect regardless of the value of m. The low-energy excess of vibrational modes manifests itself in the low-temperature specific heat as a pronounced peak in the Cp(T)/T3 data near 10 K. The lack of significant anharmonicity beyond that associated with the thermal expansion of the lattice suggests that the inherent disorder in the monoclinic unit cell and scattering at interlayer interfaces are the most important ingredients that limit the heat transport in this series of compounds.
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hal-02391383 , version 1 (24-03-2020)

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Selma Sassi, Christophe Candolfi, Anne Dauscher, Bertrand Lenoir, Michael Marek Koza. Inelastic neutron scattering study of the lattice dynamics of the homologous compounds (PbSe)5(Bi2Se3)3m (m = 1, 2 and 3). Physical Chemistry Chemical Physics, 2018, 20 (21), pp.14597-14607. ⟨10.1039/c8cp01277f⟩. ⟨hal-02391383⟩
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