High-energy oxygen phonon modes and superconductivity in Ba/sub 1/minus//ital x//K/sub /ital x//BiO/sub 3/: An inelastic-neutron-scattering experiment and molecular-dynamics simulation

Journal Article · Mon May 29 04:00:00 EDT 1989 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.62.2628· OSTI ID:6258098

Loong, C; Vashishta, P; Kalia, R K; Degani, M H; Price, D L; Jorgensen, J D; Hinks, D G; Dabrowski, B; Mitchell, A W; Richards, D R; others, and

Phonon densities of states of insulating BaBiO/sub 3/ and superconducting Ba/sub 0.6/K/sub 0.4/BiO/sub 3/ are determined by neutron-scattering experiments. The main peaks in BaBiO/sub 3/ occur at 35, 43, 63, and 71 meV. In Ba/sub 0.6/K/sub 0.4/BiO/sub 3/, the phonon spectrum softens and is comprised of two bands around 30 and 60 meV. Molecular-dynamics results, which are in good agreement with the experiment, reveal that the observed phonon peaks are due to oxygen vibrations. The softening of oxygen phonon modes around 30 and 60 meV is due to electron-phonon coupling, indicating that Ba/sub 0.6/K/sub 0.4/BiO/sub 3/ is a normal BCS superconductor.

• Research Organization: Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439(US); Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6258098
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 62:22; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BCS THEORY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
DYNAMICS
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ENERGY-LEVEL DENSITY
EQUIPMENT
INELASTIC SCATTERING
MECHANICS
MOLECULES
NEUTRON DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PHONONS
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
QUASI PARTICLES
SCATTERING
SUPERCONDUCTORS