Current ramping rate dependence of the critical current in 2H-NbSe2 crystals

By measuring the critical current at current ramping rate of 2x10(-5) Als t o 5x10(2) Als we find that at a fined temperature and magnetic field the cr itical current in pure 2H-NbSe2 increases with increasing current ramping r ate. These experiments show that metastable states, which are missed in the usual transport measurements, do exis t in the field cooled vortex lattice . We also show that the fast transport technique provides a means of probin g the initial vortex lattice.