Abstract
We prepared Bi2Sr2CaCu2O8+δ (BSCCO, Bi2212) and Bi2-xPbx Sr2CaCu2Oy (BPSCCO) single crystal whiskers from Bi2+xSr2-xCa2Cu2Te0.5Oy and Bi2-xPbxSr2 Ca2Cu2Te0.5Oy precursors using a tellurium-doped method, respectively. X-ray diffraction patterns revealed that the resulting whiskers showed a single crystalline Bi2212 phase. Although the temperature dependence of the resistance in the ab-plane showed a superconducting transition at T = 84 K and 107 K, a transition along the c-axis was observed only at T = 84 K. This indicates the intergrowth of the Bi2Sr2Ca2Cu3O10+δ (Bi2223) phase. The Pb- and Te-dual doping method suppresses the crystal growth of the BPSCCO whisker, and the superconductivity of the BPSCCO whisker is easily destroyed by annealing at 450°C in air. A mesa-type BSCCO intrinsic Josephson junction (IJJ) oscillator was fabricated with a single crystalline whisker. The current-voltage ( I-V) characteristics of the fabricated oscillator show a multibranch structure. The critical current is 14 mA at 4.2 K for a mesa structure ~ 300 μm in length and ~20 μm in width, which is higher than that previously reported for a whisker-based IJJ structure. Furthermore, a negative differential resistance in the I-V characteristics was observed below 40 K. A BSCCO whisker might be a potential candidate material for constructing an IJJ terahertz electromagnetic wave oscillator.
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