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Unconventional electron-phonon interactions in high-temperature superconductors (CROSBI ID 167850)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Bussmann-Holder, Annette ; Bishop, Alan R. ; Batistić, Ivo Unconventional electron-phonon interactions in high-temperature superconductors // Physical review. B, Condensed matter, 43 (1991), 16; 13728-13731. doi: 10.1103/PhysRevB.43.13728

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

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Fizika

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