Cuprate interband model and doping dependence of the coherence length

Abstract

The free energy expansion of a two-band pair-transfer superconductor is developed. A critical in temperature and a noncritical coherence length appear. The effective in-plane ${\xi }_{ab}$, $H_{c2}\sp c\sim ξ_{ab}\sp{-2}$ and the thermodynamic critical magnetic field ($H_{c0}$) on the whole hole doping ($p$) scale are calculated for a "typical'' cuprate. A doping-prepared bare spectrum with normal state gaps quenched by doping has been used. The coherence length ${\xi }_{ab}$ falls with $p$ first rapidly. A moderate enhancement starts when the "cold'' defect band overlap with the valence band is reached. At overdoping ${\xi }_{ab}$ rises markedly. The $H_{c2}\sp c$ curve shows a maximum before $T_{cmax}$. The bell-like $H_{c0}$-curve follows closely $T_c$, superconducting gaps, and superfluid density. The theoretical ${\xi }_{ab}(p)$ nonmonotonic curve on the whole doping scale agrees with a recent experimental finding.

15 pages, 3 Postscript figures