ON THE FLUCTUATION-INDUCED SUPERCONDUCTIVITY PSEUDOGAP

The influence of spatially correlated order parameter fluctuations on the elementary excitations in the normal phase of a superconductor has been investigated. As a result of fluctuations, a pseudogap on the Fe rmi surface is present. The magnitude of the pseudogap decreases with temperature rising and it is essentially scaled with the parameter alp ha = epsilon(F)/kT(c). This explains why the pseudogap has been observ ed in high-T-c systems and not in the conventional superconductors and its suppression in the overdoped high-T-c systems. (C) 1998 Elsevier Science B.V.