Biordered superconductivity and strong pseudogap state

V. I. Belyavsky; Yu. V. Kopaev

doi:10.1103/PhysRevB.76.214506

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Biordered superconductivity and strong pseudogap state

V. I. Belyavsky, Yu. V. Kopaev

DOI 10.1103/PhysRevB.76.214506 · Physical Review B

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Abstract

Interrelation between the two-particle and mean-field problems is used to describe the strong pseudogap and superconducting states in cuprates. We present the strong pseudogap state as an off-diagonal short-range order (ODSRO) originating from quasistationary states of the pair of repulsing particles with large total momentum (K pair). Phase transition from the ODSRO state into the off-diagonal long-range ordered (ODLRO) superconducting state is associated with Bose-Einstein condensation of the K pairs. A checkerboard spatial order observable in the superconducting state in the cuprates is explained by a rise of the K-pair density wave. A competition between the ODSRO and ODLRO states leads to the phase diagram typical of the cuprates. Biordered superconducting state of coexisting condensates of Cooper pairs with zero momentum and K pairs explains some properties of the cuprates observed below Tc: Drude optical conductivity, unconventional isotope effect, and two-gap quasiparticle spectrum with essentially different energy scales.