Using high-resolution angle-resolved photoemission data in conjunction with that from neutron and other probes, we show that electron-phonon coupling is strong in cuprate superconductors and that it plays an important role in pairing. In addition to the strong electron correlation, the inclusion of phonons provides a theoretical framework explaining many important phenomena that cannot be understood by a strongly correlated electronic model alone. In particular, it is indispensable to explain the difference among materials. The phonons with the wavenumber around the (0, qy) and (qx, 0) axes create d-wave pairing while that near (π, π) are pair breaking. Therefore the half-breathing mode of the oxygen motions helps d-wave superconductivity.
|ジャーナル||Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties|
|出版ステータス||Published - 2002 9|
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