In order to investigate the effect of intrinsic pinning on the glassy state, we have measured current-voltage (I-V) curves of CVD YBa2Cu3O7-δ near the glass transition temperature Tg as a function of the angle θ between magnetic field and c-axis. In the scaling analysis of I-V curves based on the vortex-glass model, it is found that the glass scaling function and the critical exponents are independent of θ, and do not show a remarkable change even at θ=90° (H⊥c). Our result indicates that the periodic plane-like intrinsic pinning is not so effective near Tg and vortices are pinned in random point-like disorder for all field directions.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering