Intrinsic inhomogeneities in superconductors and the pseudogap phenomenon
Yu. N. Ovchinnikov, S. A. Wolf, V. Z. Kresin
DOI 10.1103/PhysRevB.63.064524 · Physical Review B
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Abstract
High-Tc oxides are intrinsically inhomogeneous materials. The density of states is evaluated for such an inhomogeneous system, and it displays a gap structure above Tcres (pseudogap). Thus, the pseudogap phenomenon can be caused by an inhomogeneity of the metallic phase. As a result, the critical temperature is spatially dependent. Various types of nonuniform structure are described (inhomogeneous carrier distribution, nonuniform distribution of pair breakers). The transition to a dissipationless state (R=0) corresponds to the percolation threshold.
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