The ponderomotive force effects on surface waves at a plasma-metal int
erface are studied. The waves propagate across an external magnetic fi
eld parallel to the interface. It is shown that the account of the pon
deromotive force can lead to the appearance of solitons, which are not
possible when the second-harmonic and magnetic nonlinearities are con
cerned. (C) 1998 American Institute of Physics. [S1070-664X(98)01011-8
].