Pregled bibliografske jedinice broj: 240164
Polaron origin for anharmonicity of the axial oxygen in YBa_2Cu_3O_7
Polaron origin for anharmonicity of the axial oxygen in YBa_2Cu_3O_7 // Physical review letters, 68 (1992), 21; 3236-3239 doi:10.1103/PhysRevLett.68.3236 (međunarodna recenzija, članak, znanstveni)
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Naslov
Polaron origin for anharmonicity of the axial oxygen in YBa_2Cu_3O_7
Autori
Mustre de Leon, Jose ; Batistić, Ivo ; Bishop, Alan R. ; Conradson, S.D. ; Trugman, Stuart A.
Izvornik
Physical review letters (0031-9007) 68
(1992), 21;
3236-3239
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
high temperature superconductors ; polarons ; axial O ; strongly correlated motion ; anharmonicity ; exact diagonalization
Sažetak
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.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
Citiraj ovu publikaciju:
Časopis indeksira:
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
- MEDLINE
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