Abstract This paper deduces that the particular electronic structure of cuprate superconductors confines Cooper pairs to be first 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 also shows that the symmetry of the pseudogap and the superconducting gap are determined by the electronic structure, and non-s wave symmetry gap favours the high-temperature superconductivity. Why the high-temperature superconductivity occurs in the metal region near the Mott metal-insulator transition is also explained.
Cao Tian-De(曹天德) Crossover from a pseudogap state to a superconducting state 2010 Chin. Phys. B 19 117401
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Synthesis and properties of La1-xSrxNiO3 and La1-xSrxNiO2 Mengwu Huo(霍梦五), Zengjia Liu(刘增家), Hualei Sun(孙华蕾), Lisi Li(李历斯), Hui Lui(刘晖), Chaoxin Huang(黄潮欣), Feixiang Liang(梁飞翔), Bing Shen(沈冰), and Meng Wang(王猛). Chin. Phys. B, 2022, 31(10): 107401.
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