Evidence for two fluids in cuprate superconductors from a nuclear resonance study of (Ca_xLa_1−x)(Ba_1.75−xLa_0.25+x)Cu₃O_y

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Amit Keren, Amit Kanigel, and Galina Bazalitsky
Technion–Israel Institue of Technology, 32000 Haifa, Israel

Received 21 September 2006; published 27 November 2006

Wereport charge density measurements, using NMR, in the superconducting compound(Ca_xLa_1−x)(Ba_1.75−xLa_0.25+x)Cu₃O_y,which has two independent variables, x (family) and y (oxygen).For underdoped samples we find the rate at which holesare introduced into the plane upon oxygenation to be familyindependent. In contrast, not all carriers contribute to either antiferromagneticor superconducting order parameters. This result is consistent with atwo-fluid phenomenology or intrinsic mesoscopic inhomogeneities in the bulk. Wealso discuss the impact of weak chemical disorder on T_c.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.172506
DOI:	10.1103/PhysRevB.74.172506
PACS:	74.72.-h; 74.25.Ha; 74.25.Nf 74.72.-h Cuprate superconductors (high-T_c and insulating parent compounds) 74.25.Ha Magnetic properties of superconductors 74.25.Nf Superconductor response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) YEAR: 2006
KEYWORDS:	calcium compounds, lanthanum compounds, barium compounds, high-temperature superconductors, antiferromagnetic materials, ground states, charge density waves, nuclear magnetic resonance, superconducting transition temperature

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