Charge and Phase Fluctuations in Attractive Hubbard Model
Grzegorz Litak
Abstract
Using the negative U Hubbard model we analyze normal state properties of a superconductor. In this model there exists a characteristic pairing temperature TP above a superconducting critical temperature. Below TP electrons start to form incoherent pairs. The fluctuations in charge and phase are precursors of charge density wave and superconductivity phases depending on band filling. They lead naturally to pseudogap opening in the density of states.
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