Guo-meng Zhao, A. S. Alexandrov
We have analyzed scanning tunneling spectra of two electron-doped cuprates Pr0.88LaCe0.12CuO4 (Tc = 21 K and 24 K) and compared them with tunneling spectrum of hole-doped La1.84Sr0.16CuO4 and effective electron-boson spectral function of hole-doped La1.97Sr0.03CuO4 (extracted from angleresolved photoemission spectrum). We have also compared tunneling spectra and angle-resolved photoemission spectra for hole-doped Bi2Sr2CaCu2O8. These results unambiguously rule out dwave magnetic pairing mechanism in both electron- and hole-doped cuprates. In contrast, the polaron-bipolaron theory of superconductivity, which is based on realistic electron-electron correlation and strong long-range electron-phonon interaction, is compatible with most experimental results including the Cooper pairing and large Fermi surface observed in optimally doped and overdoped cuprates.
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http://arxiv.org/abs/1208.3128
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