Phonon density of states, anharmonicity, electron-phonon coupling, and possible multigap superconductivity in the clathrate superconductorsBa8Si46andBa24Si100: Factors behind large difference inTc

2008/04/03 by Rolf Lortz, R. Viennois, Romain Viennois +14 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Anharmonicity #Chemistry #Clathrate hydrate #Condensed matter physics #Density of states #Hydrate #Inelastic neutron scattering #Inelastic scattering #Iron-based superconductors research #Phonon #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Scattering #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.77.224507

31 pages, 2 tables, 12 figures

arxiv created 2008/04/03 · openalex publication_date 2008/06/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report a detailed study of specific heat, electrical resistivity, and thermal expansion in combination with inelastic neutron and inelastic x-ray scattering to investigate the origin of superconductivity in the two silicon clathrate superconductors Ba₈Si₄₆ and Ba₂₄Si₁₀₀. Both compounds have a similar structure based on encaged barium atoms in oversized silicon cages. However, the transition temperatures are rather different: 8 and 1.5 K, respectively. By extracting the superconducting properties, phonon density of states, electron-phonon coupling function, and phonon anharmonicity from these measurements, we discuss the important factors governing T_c and explain the difference between the two compounds.

Citations

• Properties of boson-exchange superconductors
• The Electron–Phonon Interaction in Metals

Cited by

• Phonon mode spectroscopy, electron-phonon coupling, and the metal-insulator transition in quasi-one-dimensionalM2Mo6Se6