Abstract
Abstracts We present a strong-coupling study of the competition and interplay between the d -density wave (DDW) and d -wave superconducting (DSC) states within the fluctuation-exchange approximation for the two-dimensional Hubbard model. We find the occurrence of a new DDW state with phase fluctuations induced by spin fluctuations above T C . It is shown that in this state the density of states has a pseudogap, which is strong in the underdoped regime, but is weak in the overdoped regime. We obtain new results for the full reduction of T C in the strong DDW state, a strong enhancement of T C in the weak DDW state, and the coexistence of the ordered DDW and DSC states below T C . This sheds new light on a comprehensive explanation of both the pseudogap and high- T C superconductivity in cuprates.
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