Temperature dependence of supercurrent distribution in YBCO thin film strips observed by terahertz radiation imaging

We study vortex penetration into YBCO thin films by terahertz radiation ima ging. The supercurrent distributions and corresponding magnetic field ones in the thin film strips with and without the ordered array of small antidot s are quantitatively evaluated in a remanent state and their temperature de pendence is discussed. The results indicate that the distributions and thei r temperature dependence in the strips with the antidots remarkably differ from those without the antidots. (C) 2001 Elsevier Science B.V. All rights reserved.