
TY  - JOUR
A1  - Shan, Lei 
A1  - Aruna, Sahr Augustine 
A1  - Xu, Xiao-Nong 
A1  - Wang, Zhi-He 
A1  - Jin, Xin 
T1  - Real Critical Current Density and Material Power Law of YBa<emph tye="8">2</emph>Cu<emph tye="8">3</emph>O<emph tye="8">7-<font face="symbol">d</font></emph> Epitaxial Thin Film
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 2001
VL  - 53
IS  - 6
SP  - 821
EP  - 828
KW  - 
UR  - https://doi.org/10.1071/PH00081 
N2  - The current&#8211;voltage characteristics have been measured on aYBa2Cu3O7-&#948; epitaxial thin film. Using a material power law, we determine the temperature and field dependencies of the characteristic pinning potential UJand the real critical current density Jc at different fields and temperatures. It is shown that Jc is completely different from the conventional critical current density JE, which is determined by the electronic-field criterion. Thus, the time-honoured electronic-field criterion is no longer reasonable for high-Tc superconductors. By further investigation of the results of Jc and UJ, we are able to present a physical picture of the transformation of the pinning potential well with increasing temperature and hence determine the transition point from vortex-glass phase to vortex-liquid phase. 
ER  -

