Hitachi, Ltd.

Ryou Nishiwaki

Michiya Okada

Tomoichi Kamo

Toshihide Nabatame

Shinpei Matsuda

Toyotaka Yuasa

Yukio Saito

Katsuzo Aihara

Yoshihide Wadayama

Toshimi Matsumoto

A high-temperature oxide superconductor is provided and comprises oxide crystals oriented in a certain direction, the oxide superconductor being substantially free of or containing a controlled amount of foreign phases, a non-superconducting phase and weak superconducting phase which are harmful for superconducting characteristics in the grains of the crystals and at the grain boundaries between the crystals. The foreign phases, if any, are finely and uniformly dispersed in the grains of the oxide crystals and at the grain boundaries. A wire made from the oxide superconductor, a coil from the wire, and a magnetic field generator from the coil are disclosed, the superconductor wire having only a single layer of oxide crystal grains in the thickness direction.

Oxide superconductor, superconducting wire and coil using the same and

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Hitachi, Japan

Ryou Nishiwaki