Oxide superconductor and process of producing the same

Details Oxide superconductor and process of producing the same Oxide superconductor and process of producing the same

1996-07-22

1998-07-07

King, Roy V.

Superconductor technology: apparatus, material, process

High temperature , per se

Copper containing

505126, 505121, 505500, 505501, 505742, 505782, H01L 3912, C04B 3545

Patent

active

057768625

ABSTRACT:
The hole density of an oxide superconductor having holes as carriers is higher than the hole density to bring the highest value of the superconductivity critical temperature Tc thereof, and it can be made higher than the optimal density to bring the highest Tc value by treating the oxide superconductor with heat in an oxidizing gas atmosphere, or by replacing positive ions constituting the oxide superconductor except for copper with ions of a low valence number. Accordingly, it is possible to substantially reduce the rate of decrease of the critical current density owing to an applied magnetic field when the magnetic field is applied parallel to the crystal c axis, and to allow a current conductor produced by using the oxide superconductor to have high critical current density.

REFERENCES:
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Hensel, et al., "A Model for the Critical Current in (Bi,Pb).sub.2 SR.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x Silver-Sheathed Tapes", Physica C205, pp. 329, and 333 (Fig. 5).
Digest of the 47th Spring Lecture, the Cryogenic Engineering and Superconductivity Institute, p. 88, DI-17 (1992).
Kozo Osamura et al., "Effect o Thermomechanical Treatment on the Critical Current Density of AG-Sheathed B(Bb)SCCO Tapes", Superconductor Science & Technology, Mar. 1, 1990, vol. 3, No. 3, pp. 143-147.
J. Schwartz et al., "Large Cricital Current Density in Neutron-Irradiated Polycrystalline HgBa/.sub.2 CuO.sub.4+.delta. ", Physical Review B, vol. 48, No. 13, Oct. 1993, pp. 9932-9934.
A. Maeda et al., "Physical Properties of Bi.sub.2 Sr.sub.2 Ca.sub.2-1 Cu.sub.n O.sub.y (n=1, 2, 3)", Physical Review B, vol. 41, No. 10, Apr. 1, 1990, pp. 6418-6434.
"Critical Temperature Nears 135K in a Mercury-Based Superconductor", Physics Today, Jul. 1993, pp. 20-23.
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