The influence of anharmonic phonons on the isotope effect in high- Tc oxides

Conference · Tue Dec 31 23:00:00 EST 1991

OSTI ID:5132046

Crespi, V H; Cohen, M L

Anharmonic phonons are examined to study the unusual isotope effect exponents for the high-{Tc} oxides. Within a simple model of anharmonicity, the mass dependences of the electron-phonon coupling constant {lambda} and the phonon frequency determine the isotope effect exponent {alpha} as a function of coupling strength. A model in which the outer wells of a multiple-well potential deepen as the orthorhombic/low temperature tetragonal phase transition in La{sub 2-x}M{sub x}CuO{sub 4} is approached is consistent with some experimentally observed variations in {Tc} and {alpha}. 10 refs.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• Sponsoring Organization: DOE; NSF; USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5132046
• Report Number(s): LBL-31865; CONF-920141--8; ON: DE92017083; CNN: DMR88-18404
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANHARMONIC CRYSTALS
ANHARMONIC OSCILLATORS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
CRYSTAL STRUCTURE
CRYSTALS
ELECTRON-PHONON COUPLING
ELECTRONIC EQUIPMENT
EQUIPMENT
HIGH-TC SUPERCONDUCTORS
ISOTOPE EFFECTS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
OSCILLATORS
OXIDES
OXYGEN COMPOUNDS
PHONONS
QUASI PARTICLES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES