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Current-voltage hysteresis in GdBa2Cu3O7−δ ceramics in air at room temperature

Published online by Cambridge University Press:  31 January 2011

Yoshiaki Kurihara ,
Tomoichiro Okamoto ,
Ben Huybrechts  and
Masasuke Takata
Yoshiaki Kurihara
Affiliation:
Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940–21, Japan
Tomoichiro Okamoto
Affiliation:
Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940–21, Japan
Ben Huybrechts
Affiliation:
Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940–21, Japan
Masasuke Takata
Affiliation:
Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940–21, Japan
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Abstract

We report here on the appearance of a hysteresis in the current-voltage characteristic, when a voltage is applied to a GdBa2Cu3O7−δ rod at room temperature. This hysteresis was caused by the appearance and disappearance of a hot spot. When a gradually increasing dc voltage (0–8 V) was applied to a GdBa2Cu3O7−δ rod, a hot spot appeared at a given voltage, Va. Further increasing of the voltage increased the spot size, while the current stayed constant. When a voltage of 8 V was reached, the voltage was gradually decreased. The spot did not disappear at Va, but at a voltage 0.2 to 1.3 V lower than Va. The current remained constant until the spot disappeared. By the authors' best knowledge, this is the first report of a hysteresis in the current-voltage characteristic at room temperature for a high Tc superconductor.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 3 , March 1996 , pp. 549 - 551
Copyright
Copyright © Materials Research Society 1996

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References

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