Abstract :
We have studied the effect of the cooling time of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// films on the properties of bicrystal Josephson junctions. In the three regions of the cooling time as 5/spl sim/6, 10/spl sim/20, and more than 30(min.), the junctions´ Tc were above 87K, 50/spl sim/86K and above 86K, and the average value of the IcRn products at 77K were 0.12mV, 50/spl mu/V, and 80/spl mu/V, respectively. The junction´s Tc, the I-V curves, and the junction parameters were changed due to the change of the cooling time. As a result, it was found that the cooling time was very important factor to determine the junction properties.
Keywords :
Josephson effect; barium compounds; bicrystals; grain boundaries; high-temperature superconductors; superconducting thin films; yttrium compounds; I-V characteristics; YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// film growth; YBa/sub 2/Cu/sub 3/O/sub 7/; bicrystal grain boundary Josephson junction; cooling time; critical current normal resistance product; critical temperature; small-scale circuit; Cooling; Gas lasers; Grain boundaries; Josephson junctions; Pulsed laser deposition; Substrates; Superconducting films; Temperature distribution; X-ray scattering; Yttrium barium copper oxide;
