Title :
Characteristics of junctions made between Pb and Bi2Sr 2CaCu2O8+x
Author :
Yang, YiFeng ; Nordman, James E.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
Investigations of the junctions made between Pb and polycrystalline Bi2Sr2CaCu2O8+x (BSCCO) are reported. The BSCCO surfaces were treated with a number of methods, including mechanical scraping, plasma sputtering, plasma oxidation, and Br etch, before junctions were fabricated. The current-voltage characteristics and dynamic resistance (dV/dI) vs. voltage were measured at both 77 K and 4.2 K. The authors observed a Pb gap structure similar to that seen in Pb/YBa2Cu3O7-δ junctions, a magnetic-dependent supercurrent, an asymmetric I-V curve, and narrow resistance peaks. Properties of junctions prepared in different manners are compared. Both X-ray photoemission spectroscopy and electrical studies indicated that Br etch is not suitable for the BiSrCaCuO system in spite of its successful application in YBa2 Cu3O7-δ
Keywords :
X-ray photoelectron spectra; bismuth compounds; calcium compounds; high-temperature superconductors; lead; strontium compounds; superconductive tunnelling; Br etch; Pb gap structure; Pb-Bi2Sr2CaCu2O8+x; X-ray photoemission spectroscopy; asymmetric I-V curve; current-voltage characteristics; dynamic resistance; electrical studies; high temperature superconductor; junctions; magnetic-dependent supercurrent; mechanical scraping; plasma oxidation; plasma sputtering; tunnelling; Bismuth compounds; Oxidation; Plasma applications; Plasma measurements; Plasma properties; Sputter etching; Sputtering; Strontium; Surface resistance; Surface treatment;
Journal_Title :
Magnetics, IEEE Transactions on
