Unconventional electron-phonon interactions in high-temperature superconductors (CROSBI ID 167850)
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Podaci o odgovornosti
Bussmann-Holder, Annette ; Bishop, Alan R. ; Batistić, Ivo
engleski
Unconventional electron-phonon interactions in high-temperature superconductors
The infrared absorption of the 155-cm/sup -1/ c-axis mode of YBa/sub 2/Cu/sub 3/O/sub 7/ is calculated on the basis of an anharmonic-electron-phonon-interaction model and a large enhancement of its intensity is obtained. A double-well potential in the electron-phonon interaction gives the right order of magnitude for shifts in the bridging O(4) position in agreement with recent extended X-ray-Absorption fine-structure data. Electron-density- two-phonon-interaction terms are derived which represent a violation of the Migdal theorem and a BCS-type superconducting state with nonlinearly enhanced electron-phonon coupling is expected together with an anisotropy of the superconducting energy gap.
high temperature superconductors ; structural instability ; electron-phonon interactions
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Podaci o izdanju
43 (16)
1991.
13728-13731
objavljeno
0163-1829
1095-3795
10.1103/PhysRevB.43.13728