Pairing and Phase Coherence in High Temperature Superconductors

Details Pairing and Phase Coherence in High Temperature Superconductors Pairing and Phase Coherence in High Temperature Superconductors

1997-03-25

arxiv.org/abs/cond-mat/9703211v1

Physica C 282-287, 174-177 (1997).

Physics

Condensed Matter

4 pages. Proceedings of MMS-High Temperature Superconductivity, V (1997) To be published in Physica C

Scientific paper

10.1016/S0921-4534(97)00255-4

Mobile holes in an antiferromagnetic insulator form a slowly fluctuating array of quasi one-dimensional metallic stripes, which induce a spin gap or pseudogap in the intervening Mott-insulating regions. The mobile holes on an individual stripe acquire a spin gap via pair hopping between the stripe and its environment; i.e. via a magnetic analog of the usual superconducting proximity effect. This process is the analog of pairing in conventional superconductors. At non-vanishing stripe densities, Josephson coupling between stripes produces a dimensional crossover to a state with long-range superconducting phase coherence. In contrast to conventional superconductors, the superconducting state is characterised by a high density of (spin) pairs, but the phase stiffness, which is determined by the density and mobility of holes on the stripes, is very low.

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