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Influence of silver on critical current of the Y–Ba–Cu–O superconductor

Published online by Cambridge University Press:  31 January 2011

Mineo Itoh ,
Hiroyuki Ishigaki ,
Takashi Ohyama ,
Takumi Minemoto ,
Hiroyuki Nojiri  and
Mitsuhiro Motokawa
Mineo Itoh
Affiliation:
Faculty of Science and Technology, Kinki University, Higashi-Osaka 577, Japan
Hiroyuki Ishigaki
Affiliation:
Faculty of Science and Technology, Kinki University, Higashi-Osaka 577, Japan
Takashi Ohyama
Affiliation:
Faculty of Engineering, Kobe University, Kobe 657, Japan
Takumi Minemoto
Affiliation:
Faculty of Engineering, Kobe University, Kobe 657, Japan
Hiroyuki Nojiri
Affiliation:
Faculty of Science, Kobe University, Kobe 657, Japan
Mitsuhiro Motokawa
Affiliation:
Faculty of Science, Kobe University, Kobe 657, Japan
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Abstract

Electrical properties of Y–Ba–Cu–O superconductors, such as the critical current density and the zero-resistance temperature, are systematically improved by changing the compression pressure during the formation process of the specimens. Also, by changing the silver powder content of the superconducting Y–Ba–Cu–O powder, the critical current density and the zero-resistance temperature are remarkably improved. The resistance-drop temperature is insensitive to changes in the compression pressure, silver content, and magnetic field, if the field is applied perpendicular to the specimens. The critical current density of the specimens with and without silver decreases exponentially with the perpendicular magnetic field. The critical current densities of specimens without silver showed much lower sensitivity to perpendicularly applied magnetic fields than those of the specimens having a silver content. Along with the above improvements, the present paper also examines several factors that affect the superconducting characteristics. These factors include impurities in the air and strong magnetic fields.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 11 , November 1991 , pp. 2272 - 2279
Copyright
Copyright © Materials Research Society 1991

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