Evidence for two fluids in the ground state of cuprates
Amit Keren, Amit Kanigel, Galina Bazalitsky
Abstract
We report charge density measurements, using NMR, in the superconducting compound (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy, 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 Tc.
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