  We have used the pulsed muon source at ISIS to study high-temperature Na-ion
dynamics in the quasi-one-dimensional (Q1D) metallic antiferromagnet NaV2O4. By
performing systematic zero-field and longitudinal-field measurements as a
function of temperature we clearly distinguish that the hopping rate increases
exponentially above Tdiff=250 K. The data is well fitted to an Arrhenius type
equation typical for a diffusion process, showing that the Na-ions starts to be
mobile above Tdiff . Such results makes this compound very interesting for the
tuning of Q1D magnetism using atomic-scale ion-texturing through the periodic
potential from ordered Na-vacancies. Further, it also opens the door to
possible use of NaV2O4 and related compounds in energy related applications.
