M-Tl-Ba-Cu-O high temperature superconductors wherein M is selec

Details M-Tl-Ba-Cu-O high temperature superconductors wherein M is selec M-Tl-Ba-Cu-O high temperature superconductors wherein M is selec

1992-02-18

1994-04-19

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Thallium containing

252518, 252521, 505783, C01G 302, C01G 1500, H01B 108, H01L 3912

Patent

active

053045378

ABSTRACT:
A high-temperature superconducting system comprising M-Tl-Ba-Cu-O wherein: M is selected from the group consisting of Ti, Zr, and Hf. In one embodiment, the M-Tl-Ba-Cu-O system forms a high Tc phase of approximately 90 K wherein: M is selected from the group consisting of Zr and Hf. In another embodiment, a nominal ZrTl.sub.2 Ba.sub.2 Cu.sub.3 O.sub.10 sample forms a high Tc phase of above 100 K.

REFERENCES:
patent: 5217949 (1993-06-01), Liu
Sheng "Superconductivity in the rare earth free Tl-Ba-Cu-O . . . " Nature v. 332 Mar. 3, 1988 pp. 55-58.
Nakajima "Over doping of Tl.sub.2 Ba.sub.2 CuO.sub.6 . . . " Physica C v. 160 1989 pp. 458-460.
Hsu "Photoemission search for an RVB state . . . " American Institute of Physics 1990 pp. 49-52.

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