Current-Voltage Characteristics of Bi2Sr2CaCu2O8+δ in the C-Axis Direction

  • J. Takeya
  • S. Akita
  • J. Shimoyama
  • K. Kishio
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

Current-voltage (I-V) characteristics of Bi2Sr2CaCu2O8+δ single crystals were measured in the c-axis direction as a function of temperature and magnetic field parallel to the current. In order to eliminate heating effect, a voltage pulse with a width of 0.5 – 1 μs was applied for each I-V point. We found an ohmic region far below the gap voltage. The ohmic resistance increased with decreasing temperature and grew 30 times larger at 4.2 K than that at room temperature. Magnetic field strongly suppressed the critical current but did not change this ohmic resistance. These behaviors can be explained by a semiconductive shunt resistance connected in parallel to a stack of Josephson junctions. By applying two-step voltage pulses, we observed a hysteretic feature of the intrinsic Josephson junctions. Crystals with different oxygen contents showed a large variation in critical current, normal resistance, the shunt resistance at low temperature and the degree of hysteresis due to a difference in anisotropy ratios. Utilizing the bistability revealed by the hysteretic feature, the Bi2212 crystal can function as a switching device in the c-direction. A natural stack of many junctions will exhibit large response voltage, which is a great advantage for application to power devices.

Keywords

Contact Resistance Josephson Junction Anisotropy Ratio Response Voltage Shunt Resistance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • J. Takeya
    • 1
  • S. Akita
    • 1
  • J. Shimoyama
    • 2
  • K. Kishio
    • 2
  1. 1.Central Research Institute of Electric Power IndustryKomae-shi, Tokyo, 201Japan
  2. 2.The University of TokyoBunkyo-ku, Tokyo, 113Japan

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