Effect of compositional variation and annealing in oxygen on superconducting properties of Y1Ba2Cu3O8−y

A. J. Panson; A. I. Braginski; J. R. Gavaler; J. K. Hulm; M. A. Janocko; H. C. Pohl; A. M. Stewart; J. Talvacchio; G. R. Wagner

doi:10.1103/PhysRevB.35.8774

Effect of compositional variation and annealing in oxygen on superconducting properties of Y1Ba2Cu3O8−y

A. J. Panson, A. I. Braginski, J. R. Gavaler, J. K. Hulm, M. A. Janocko, H. C. Pohl, A. M. Stewart, J. Talvacchio, G. R. Wagner

DOI 10.1103/PhysRevB.35.8774 · Physical Review B

T1

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Abstract

Changes in the ratios of cations by ∼10% off the Y1Ba2Cu3O8−y composition demonstrated that a range of solid solutions exists in this material. The critical temperature within this range is strongly composition dependent and falls off from above 90 K to ∼70 K. Annealing stoichiometric samples in 1 bar of oxygen at 700 °C for 36 and 108 h resulted in narrowing of the magnetic susceptibility transition and significant increases in the critical current density Jc, p-type effective carrier concentration n*, and upper critical field, Hc2. After annealing, Jc between 5 and 60 kOe was (3–1.5)×104 A/cm2 at 4.2 K and (2–0.5)×102 A/cm2 at 77 K. The value of n* after annealing was 4.2×1021 cm−3. An extrapolated value of Hc2(T=0)=1.2 MOe was obtained from ‖dHc2/dT‖=19 kOe/K. A set of microscopic superconducting parameters was derived from results of resistive measurements made on a single, annealed specimen.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Y1Ba2Cu3O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure unresolved	onset
Y1Ba2Cu3O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure unresolved	onset
Y1.05Ba1.8Cu3.0O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	70	Pressure unresolved	onset
Y1.05Ba1.8Cu3.0O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	81	Pressure unresolved	onset
Y1.0Ba2.2Cu3.0O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	70	Pressure unresolved	onset
Y1.0Ba2.2Cu3.0O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	94	Pressure unresolved	onset
Y1.2Ba0.8CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	onset
Y0.6Ba0.4CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	onset