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Crossover from a pseudogap state to a superconducting state
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On the basis of our calculation we deduce that the particular electronic structure of cuprate superconductors confines Cooper pairs to be firstly formed in the antinodal region which is far from the Fermi surface, and these pairs are incoherent and result in the pseudogap state. With the change of doping or temperature, some pairs are formed in the nodal region which locates the Fermi surface, and these pairs are coherent and lead to superconductivity. Thus the coexistence of the pseudogap and the superconducting gap is explained when the two kinds of gaps are not all on the Fermi surface. It is also shown that the symmetry of the pseudogap and the superconducting gap are determined by the electronic structure, and non-s wave symmetry gap favors the high-temperature superconductivity. Why the high-temperature superconductivity occurs in the metal region near the Mott metal-insulator transition is also explained.
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Evidence of the Cooper-Pair Field with Gaussian Memory Kernel in Unconventional Superconductors
Cuprate superconductivity reorganizes a Gaussian-memory Cooper-pair continuum between incoherent pseudogap and coherent Bogoliubov channels, with Raman/ARPES/tunneling as complementary PCF projections.
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