Evidence for two fluids in the ground state of cuprates

Details Evidence for two fluids in the ground state of cuprates Evidence for two fluids in the ground state of cuprates

2006-10-22

arxiv.org/abs/cond-mat/0610595v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

We report charge density measurements, using NMR, in the superconducting compound (Ca_{x}La_{1-x})(Ba_{1.75-x}La_{0.25+x})Cu_3O_{y}, which has two independent variables x (family) and y (oxygen). For underdoped samples we find the rate at which holes are introduced into the plane upon oxygenation to be family-independent. In contrast, not all carriers contribute to either antiferromagnetic or superconducting order parameters. This result is consistent with a two fluid phenomenology or intrinsic mesoscopic inhomogeneities in the bulk. We also discuss the impact of weak-chemical-disorder on T_{c}.

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