MAGNETIC EXCITATIONS IN CENISN UNDER HIGH MAGNETIC-FIELD

The magnetic excitation spectrum of CeNiSn has been studied by inelast ic neutron scattering under high magnetic field up to 10 T. The well k nown modes of characteristic energies 2 and 4 meV were studied. No Zee man splitting was observed for either of them. The mode initially peak ed at 2 meV shifts continuously to higher energy. The characteristic f eature of the 4 meV mode is the broadening observed for the highest ap plied held of 10 T whereas there is no appreciable change in the spin dynamics between 0 and 6T.