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Role of the electron-phonon interaction in the strongly correlated cuprate superconductors

Zhi‐Xun Shen Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, California, 94305, USAAlessandra Lanzara Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, California, 94305, USA; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USASumio Ishihara Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, JapanNaoto Nagaosa Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan; Correlated Electron Research Center, Agency of Industrial Science and Technology, Tsukuba, 305-0046, Japan

2002en

ABI

Annotatsiya

Using high resolution angle-resolved photoemission data in conjunction with that from neutron and other probes, we show that electron-phonon (el-ph) coupling is strong in cuprates superconductors and 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. Especially it is indispensable to explain the difference among materials. The phonons with the wave number around the (0,qx) and (qx,0) axes create the d-wave pairing while that near (pi,pi) are pair breaking. Therefore the half-breathing mode of the oxygen motions helps d-wave superconductivity.

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DOI: 10.1080/13642810210142735

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