Observation of phonon softening at the superconducting transition in Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8

Journal Article · Mon Nov 19 04:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.65.2712· OSTI ID:6192846

Mook, H A; Mostoller, M; Harvey, J A; Hill, N W; Chakoumakos, B C; Sales, B C ^[1]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (USA)

Resonant neutron-absorption spectroscopy has been used to determine the temperature dependence of the average kinetic energy {l angle}{ital E}{r angle} of the Cu in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} for the directions along and perpendicular to the {ital c} axis. {l angle}{ital E}{r angle} is directly related to the Cu phonon density of states and shows essentially normal behavior as a function of temperature for the {ital c}-axis direction. However, a sudden drop in {l angle}{ital E}{r angle} is observed at the superconducting transition for the motions in the Cu-O planes.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6192846
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 65:21; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER 63
COPPER COMPOUNDS
COPPER ISOTOPES
COPPER OXIDES
DATA
ENERGY
ENERGY-LEVEL DENSITY
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
KINETIC ENERGY
LOW TEMPERATURE
NEUTRON SPECTROSCOPY
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
RESONANCE ABSORPTION
SPECTROSCOPY
STABLE ISOTOPES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE