Some of the thermodynamic properties of the low temperature vortex-glass phase of randomly pinned flux lines in 1+1 dimensions are studied. The flux arrays are found to be sensitive to small changes in external parameters such as the magnetic field or temperature. These effects are captured by the variations in the magnetic response and noise, which have universal statistics and should provide an unambiguous signature of the glass phase.

• Received 23 September 1993

DOI:https://doi.org/10.1103/PhysRevLett.72.2466