Abstract
Nonlinear current-voltage characteristics are investigated for the high-magnetic-field state of ultrathin (down to ∼1 unit cell thick) films. The current density where nonlinearity sets in, , exhibits a nontrivial power-law temperature dependence, ∝, which quantitatively verifies a prediction from the vortex-glass theory for two dimensions (2D). Additionally, a critical scaling analysis of the I-V data clearly manifests the differences between a 2D and 3D vortex glass. The results suggest that a 2D vortex glass does not order at finite temperatures.
- Received 7 July 1992
DOI:https://doi.org/10.1103/PhysRevLett.69.2717
©1992 American Physical Society