Title :
Heights of microwave induced steps, temperature dependent supercurrent and other experimental observations in YBCO weak link
Author :
Shen, N.X. ; Wu, P.H. ; Yang, S.Z. ; Cheng, Q.H. ; Sheng, Y.B. ; Luo, H.X. ; Kui, J.S.
Author_Institution :
Nanjing Univ., China
fDate :
3/1/1989 12:00:00 AM
Abstract :
For YBCO bridges made of bulk samples, the authors have carefully measured the height of the microwave-induced steps as a function of applied microwave power and found, for Ω=hf/2eI cR=0.25, approximate agreement with the Bessel function dependence. The supercurrent versus temperature dependence follows the Ic∝(1-T/Tc ) relationship quite closely at temperatures far from Tc, while in the vicinity of Tc the deviation from it can be pronounced. For bridges made of YBCO thin films, the temperate-dependent supercurrent can be expressed as I c∝(1-T/Tc)3/2 . Also discussed are some possible explanations of experimentally observed I-V curves which might be attributed to mechanisms such as self-heating and junctions in series
Keywords :
barium compounds; high-temperature superconductors; superconducting junction devices; superconducting thin films; yttrium compounds; Bessel function dependence; I-V curves; YBaCuO thin films; bridges; high temperature superconductor; junctions in series; microwave induced steps; self-heating; temperature dependent supercurrent; weak link; Bridge circuits; Bridges; Fabrication; Physics; Shape measurement; Temperature dependence; Temperature distribution; Transistors; Waveguide junctions; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
