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Unified theory of superconductivity in La2-xSrxCuO4 and Nd2-xCexCuO4

Taking the two-local-spin-mediated interaction as a Cooper pair interaction, using the BCS (Bardeen-Cooper-Schrieffer) gap equation and the phase-coherence condition for quantum phase fluctuation, this paper explains basic experimental findings concerning both p-type La2-xSrxCuO4 (LSCO) and n-type Nd2-xCexCuO4 (NCCO) at the same time, and predicts that the pseudogap should be clearly observed for underdoped NCCO.