51V-NMR study of low-temperature phase in δ-Ag2/3V2O5. (18th March 2015) - Kawasaki, Y
Abstract: 51 V-NMR experiments have been performed to investigate the local magnetic and electronic properties on the phase transition in the mixed-valence oxide δ-Ag2/3 V2 O5 . We have observed the abrupt loss of 51 V-NMR signal coming from the non-magnetic V 5+ -like ions above Tc = 225 K. It indicates that the majority of V ions are magnetic above Tc and that the phase transition is accompanied by the charge separation and charge ordering of 3 d electrons on V sites. In the charge ordered state below Tc, the magnetic V 4+ -like ions are located at both V1 and V2 sites with equal distribution.