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

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

915

Lastpage

918

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 I_c∝(1-T/T_c) relationship quite closely at temperatures far from T_c, while in the vicinity of T_c 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/T_c)^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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92436

Filename

92436