Josephson junction character along the c-axis in Bi2Sr2CaCu2O8+δ

✍ Scribed by Kazuo Kadowaki; Takashi Mochiku

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 133 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91619-5

✦ Synopsis

Critical currents along the c-axis have been studied in single crystalline Bi2Sr2CaCu208+ 8 in magnetic fields. It is ohserved that the current-voltage relation has a sudden jump with a characteristic hysteresis, reminiscent of the typical Josephson junction character. The maximum critical current density obtained is approximately 230 A/cm 2 at 0 K and it seems to follow the characteristic temperature dependence of the Josephson current. In addition, the angular dependence of the junction resistance as a function of angle between magnetic field and c-axis shows a peculiar sharp peak with a wklth less than 0.5 ° , which strongly depends upon the current density and the magnetic field. This new phenomenon very close to the ab-plane is temporarily attributed to the effect of motion of the Josephson vortex.