The a-axis oriented YBa2Cu3O7 thin films were grown on SrLaO4(100) substrate with a buffer layer of 50 nm thick Gd2CuO4 using pulsed laser deposition technique. The thickness of Y-123 thin film was about 500 nm. Intrinsic Josephson junctions (CuO2 planes) were aligned perpendicular to the substrate in the thin films. The bridge type pattern was fabricated using focused ion beam milling technique in such a way so that the current flow along the -axis in thin film. The dimensions of bridge were 1μ in length along the c-axis and 5μ in width along the b-axis. The resistance vs. temperature characteristics showed transition temperature of about 89 K. The critical current density(Jc) of 2 106A/cm2 was measured from current-voltage(I-V) characteristics at 10 K. The samples were irradiated with external microwave at 20 GHz and the was suppressed with increase in power. This suppression in indicates the formation of layered structure with strong coupling. The voltage steps were appeared with microwave irradiation in characteristics. The values of voltage steps were irregular and change with increase in power. We have also studied all a-axis oriented multilayered thin films of YBa2Cu3O7 (Y123) and PrBa2Cu3O7 (Pr123). We fabricated a submicron stack in which Josephson junctions were forming by Y123 and Pr123. The submicron stack showed response with microwave irradiation of different frequency and power. The transport characteristics of these thin films are discussed in detail.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering