An Approach to Use a Raw Single Crystal Whisker as Intrinsic Josephson Junctions Stack

作者：Saini S^*; Wang H B; Hatano T; Kim S J

来源：Journal of Superconductivity and Novel Magnetism, 2013, 26(8): 2709-2712.

DOI：10.1007/s10948-012-2078-z

• Intrinsic Josephson junctions
• Bi2212
• Single crystal whisker
• THz oscillator
• Standing whisker

We have developed a technique to observe the intrinsic Josephson effect in Bi2Sr2CaCu2O8+delta (Bi-2212) single crystal whiskers. In this technique, a raw Bi-2212 single crystal whisker used as intrinsic Josephson junctions (IJJs) along the c-axis. The technique is simple, quick, and less-cost processing. First, a whisker made to stand on ac-plane and then two electrodes were made in ab-planes on either side. The standing whisker with this configuration worked as IJJs. The standing whisker (1.6 mm x 40 mu m x 3 mu m) showed the transition temperature of about 84 K. The critical current was about 15 mA at 8 K (critical current density similar to 23 A/cm(2)). We observed voltage gap of about 500 mV in current-voltage (I-V) characteristics. This corresponds to a few hundred of IJJs out of similar to 2,000 IJJs in the whisker thickness. Observations reflect that the technique can be further improved with the single crystal quality, shape of single crystal whisker, and annealing conditions.

• 出版日期2013-8