Evidence for two fluids in cuprate superconductors from a nuclear resonance study of (CaxLa1−x)(Ba1.75−xLa0.25+x)Cu3Oy
Amit Keren, Amit Kanigel, Galina Bazalitsky
DOI 10.1103/PhysRevB.74.172506 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 58 | Pressure not reported | unknown |
| (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
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