NMR study of doped alpha '-NaV2O5 single crystals

Abstract

Na-23 and V-51 NMR in the low temperature phase of sodium vanadate show the existence of three vanadium and 8 or 10 sodium sites. These are due to the charge ordering transition and the dimerization of magnetic vanadium ions below 34 K, respectively. All vanadium sites persist to the lowest observed temperature, 4.2 K, and the re-ordering as monitored by the sodium quadrupolar satellites continues throughout the whole temperature range. Furthermore, the satellite intensities are not equal, suggesting sodium sites of varying occupancies. (C) 2002 Elsevier Science B.V. All rights reserved