Inelastic neutron scattering study of the lattice dynamics in the clathrate compound BaGe<sub>5</sub> - Archive ouverte HAL
Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2015

Inelastic neutron scattering study of the lattice dynamics in the clathrate compound BaGe5

Résumé

We report inelastic neutron scattering (INS) measurements on the polycrystalline oP60type clathrate BaGe5, whose crystal structure is related to the type-I clathrate Ba8Ge433 and to the cP124-clathrate Ba6Ge25. Our results show that BaGe5 exhibits a similar phonon density of states (PDOS) in the energy range 0-40 meV with respect to Ba8Ge433. The low-energy region of the PDOS spectrum (0-10 meV) consists of two peaks at 4.1 and 6.2 meV likely related to Ba-weighted modes. Compared to Ba8Ge433, the low-energy region of the phonon spectrum of BaGe5 shows a more complex structure, likely reflecting the presence of three distinct crystallographic sites for Ba. The specific heat data of BaGe5, reexamined in light of the INS results, indicate that the Ba-weighted modes dominate the low-temperature behavior of Cp.
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Dates et versions

hal-03998549 , version 1 (21-02-2023)

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Christophe Candolfi, Umut Aydemir, Michael Marek Koza, Michael Baitinger, Yuri Grin, et al.. Inelastic neutron scattering study of the lattice dynamics in the clathrate compound BaGe5. Journal of Physics: Condensed Matter, 2015, 27 (48), pp.485401. ⟨10.1088/0953-8984/27/48/485401⟩. ⟨hal-03998549⟩
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