Enhancement of the superconducting state in the 2H-NbSe/sub 2/--hydrogen system

Enhancement of the upper critical field H/sub c/2 and the superconducting transition temperature T/sub c/ has been observed experimentally in the system H/sub x/NbSe/sub 2/ (x< or =0.01) subjected to cycling of an external magnetic field at temperatures below T/sub c/. This effect is assumed to be due to hydrogen ordering in the field of the vortex lattice in a dynamic mixed state.