Grain boundary Josephson studies in BiSrCaCuO microbridges

Abstract

High-quality superconducting thin films of Bi2Sr2CaCu2OY have successfully been deposited on MgO (100) substrate using spray pyrolysis technique. Microbridge structures of various dimensions were patterned on the superconducting films using various techniques. A systematic study of the temperature dependence of the critical current (Ic) of the microbridges was carried out to understand the nature of the grain boundary Josephson weak links. These studies showed that the nature of the grain boundary weak links could vary from superconductor-normal metal-superconductor to superconductor-normal metal-insulator-superconductor to superconductor-insulator-superconductor, as the Jc of the microbridges is gradually decreased. The irradiation of microwaves on these microbridges led to the appearance of well-defined Shapiro steps in the I-V characteristics.

Growth and characterization of ZnO nanocrystalline thin films and nanopowder via low-cost ultrasonic spray pyrolysis

“…Earlier we have reported the successful fabrication of superconducting Josephson junctions devices [8] and HTSC-coated conductors [9] prepared via ultrasonic spray pyrolysis technique. In the present study, we have used the same simple and low cost technique to grow ZnO nanocrystalline thin films and nanopowder.…”

Quick and reliable technology for fabrication of stand-alone BSCCO mesas

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"Quick and dirty" technology for fabrication of a single BiSrCaCuO mesas

“…According Ref. [12] the BiSrCaCuO etching use to be performed in the phosphoric acid. We have also tried to use phosphoric acid but have found that this method is not suitable for deep etching.…”