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We report on muon spin rotation measurements of the internal magnetic fielddistribution n(B) in the vortex solid phase of YBa2Cu3Oy (YBCO) singlecrystals, from which we have simultaneously determined the hole dopingdependences of the in-plane Ginzburg-Landau (GL) length scales in theunderdoped regime. We find that Tc has a sublinear dependence on1/lambda_{ab}^2, where lambda_{ab} is the in-plane magnetic penetration depthin the extrapolated limits T -> 0 and H -> 0. The power coefficient of thesublinear dependence is close to that determined in severely underdoped YBCOthin films, indicating that the same relationship between Tc and the superfluiddensity is maintained throughout the underdoped regime. The in-plane GLcoherence length (vortex core size) is found to increase with decreasing holedoping concentration, and exhibit a field dependence that is explained byproximity-induced superconductivity on the CuO chains. Both the magneticpenetration depth and the vortex core size are enhanced near 1/8 hole doping,supporting the belief by some that stripe correlations are a universal propertyof high-Tc cuprates.

Hole doping dependences of the magnetic penetration depth and vortex core size in YBa2Cu3Oy: Evidence for stripe correlations near 1/8 hole doping