Hole Doping Dependence of the Coherence Length in $La_{2-x}Sr_xCuO_4$ Thin Films

Details Hole Doping Dependence of the Coherence Length in $La_{2-x}Sr_xCuO_4$ Thin Films Hole Doping Dependence of the Coherence Length in $La_{2-x}Sr_xCuO_4$ Thin Films

2003-05-12

arxiv.org/abs/cond-mat/0305244v2

Europhys. Lett.64, 790(2003).

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1209/epl/i2003-00627-1

By measuring the field and temperature dependence of magnetization on systematically doped $La_{2-x}Sr_xCuO_4$ thin films, the critical current density $j_c(0)$ and the collective pinning energy $U_p(0)$ are determined in single vortex creep regime. Together with the published data of superfluid density, condensation energy and anisotropy, for the first time we derive the doping dependence of the coherence length or vortex core size in wide doping regime directly from the low temperature data. It is found that the coherence length drops in the underdoped region and increases in the overdoped side with the increase of hole concentration. The result in underdoped region clearly deviates from what expected by the pre-formed pairing model if one simply associates the pseudogap with the upper-critical field.

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