Variation of superconductivity with carrier concentration in oxygen-doped YBa2Cu3O7−y

Z. Z. Wang; J. Clayhold; N. P. Ong; J. M. Tarascon; L. H. Greene; W. R. McKinnon; G. W. Hull

doi:10.1103/PhysRevB.36.7222

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Variation of superconductivity with carrier concentration in oxygen-doped YBa2Cu3O7−y

Z. Z. Wang, J. Clayhold, N. P. Ong, J. M. Tarascon, L. H. Greene, W. R. McKinnon, G. W. Hull

DOI 10.1103/PhysRevB.36.7222 · Physical Review B

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Abstract

The Hall coefficient RH, the volume fraction f showing the Meissner effect, and the superconducting transition temperature Tc have been measured in the high-Tc oxide YBa2Cu3O7−y for a range of oxygen vacancy concentration 0.0<y<0.7. We find that RH, f, and Tc are insensitive to y over the range 0.1<y<0.5. In this range, superconductivity at 55 K is possible (with a carrier density of 1.4×1021 cm−3), even with severe loss of connectivity in the CuO chains. The data are consistent with superconductivity occurring only in the CuO planes. A sharp transition in RH is also seen when y exceeds 0.50.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	55	Pressure not reported	midpoint
YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	midpoint
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown