Polaron origin for anharmonicity of the axial oxygen in YBa_2Cu_3O_7 (CROSBI ID 121848)
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Podaci o odgovornosti
Mustre de Leon, Jose ; Batistić, Ivo ; Bishop, Alan R. ; Conradson, S.D. ; Trugman, Stuart A.
engleski
Polaron origin for anharmonicity of the axial oxygen in YBa_2Cu_3O_7
The authors present exact diagonalization results of an electron-phonon model Hamiltonian for the O(4)-Cu(1)-O(4) cluster in YBa_2Cu_3O_7. For large enough electron-infrared-phonon coupling the motion of holes and ions becomes strongly correlated, i.e., polaronic, leading to a double-well structure for the infrared mode, as encountered in X-ray-absorption fine structure. In contrast, the associated Raman mode shows a single-well behavior even for large electron-Raman-phonon coupling. The appearance of polarons accompanies nonadiabatic behavior yielding optical spectroscopy predictions differing from those obtained from harmonic or anharmonic lattice dynamics models.
high temperature superconductors ; polarons ; axial O ; strongly correlated motion ; anharmonicity ; exact diagonalization
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Podaci o izdanju
68 (21)
1992.
3236-3239
objavljeno
0031-9007
1079-7114
10.1103/PhysRevLett.68.3236