Pair-pair interactions as a mechanism for high-T${}_c$ superconductivity

Abstract

The mutual interaction between Cooper pairs is proposed as a mechanism for the superconducting state. Above $T_c$, pre-existing but fluctuating Cooper pairs give rise to the unconventional {\it pseudogap} (PG) state, well-characterized by experiment. At the critical temperature, the pair-pair interaction induces a Bose-like condensation of these preformed pairs leading to the superconducting (SC) state. Below $T_c$, both the condensation energy and the pair-pair interaction $\beta$ are proportional to the condensate density $N_{oc}(T)$, whereas the usual Fermi-level spectral gap ${\Delta }_p$ is independent of temperature. The new order parameter $\beta (T)$, can be followed as a function of temperature, carrier concentration and disorder - i.e. the phase diagrams. The complexity of the cuprates, revealed by the large number of parameters, is a consequence of the {\it coupling of quasiparticles to Cooper-pair excitations}. The latter interpretation is strongly supported by the observed quasiparticle spectral function.

10 pages, 6 figures Higher resolution figures can be provided

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Cited by in corpus (8)

• Cooper pairs without 'glue' in high-$T_c$ superconductors
• Cuprates phase diagram deduced from magnetic susceptibility: what is the `true' pseudogap line?
• Unconventional temperature dependence of the cuprate excitation spectrum
• Origin of the Fermi arcs in cuprates: a dual role of quasiparticle and pair excitations
• How 'pairons' are revealed in the electronic specific heat of cuprates
• From Cooper-pair glass to unconventional superconductivity: a unified approach to cuprates and pnictides
• Unraveling pairon excitations and the antiferromagnetic contributions in the cuprate specific heat
• Condensation mechanism of high-$T_c$ cuprates: the key role of pairon excitations