Metastability and Glassy Behavior of a Driven Flux-Line Lattice
  Strong metastability and history dependence are observed in DC and pulsed transport studies of flux-line lattices in 2H-$NbSe_{2}$, leading to the identification of two distinct states of the lattice with different spatial ordering. The metastability is most pronounced upon crossing a transition line marked by a large jump in the critical current (the peak effect). Current induced annealing of the metastable state towards the stable state is observed with a strongly current dependent annealing time, which diverges as a threshold current is approached from above. 
W. Henderson(1) and E.Y. Andrei(1) M.J. Higgins(2) and S.   Bhattacharya(2) ((1) Rutgers University, Piscataway NJ, (2) NEC ...