D-wave Bose-Einstein condensation and the London penetration depth in superconducting cuprates

Details D-wave Bose-Einstein condensation and the London penetration depth in superconducting cuprates D-wave Bose-Einstein condensation and the London penetration depth in superconducting cuprates

1998-11-18

arxiv.org/abs/cond-mat/9811270v1

Physics

Condensed Matter

Superconductivity

4 pages (RevTeX), 4 figures

Scientific paper

10.1016/S0921-4534(99)00511-0

We show that bipolaron formation leads to a d-wave Bose-Einstein condensate in cuprates. It is the bipolaron energy dispersion rather than a particular pairing interaction which is responsible for the d-wave symmetry. The unusual low-temperature dependence of the magnetic field penetration depth in cuprates is explained by the localisation of bosons in the random potential. The temperature dependence of the penetration depth is linear with positive or negative slope depending on the random field profile.

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