Na-ion dynamics in Quasi-1D compound NaV2O4
  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. 
Martin Mansson, Izumi Umegaki, Hiroshi Nozaki, Yuki Higuchi, Ikuto   Kawasaki, Isao Watanabe, Hiroya Sakurai, Jun Sugiyama
cond-mat.mtrl-sci