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

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

OSTI ID:10160365

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: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10160365
• Report Number(s): LBL--31865; CONF-920141--8; ON: DE92017083; CNN: Grant DMR88-18404
• Country of Publication: United States
• Language: English

Related Subjects

665411
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANHARMONIC CRYSTALS
ANHARMONIC OSCILLATORS
BARIUM OXIDES
BASIC SUPERCONDUCTIVITY STUDIES
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRON-PHONON COUPLING
HIGH-TC SUPERCONDUCTORS
ISOTOPE EFFECTS
LANTHANUM OXIDES
PHONONS
STRONTIUM OXIDES
YTTRIUM OXIDES