NMR and dc susceptibility studies of NaVGe2O6статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We report the results of measurements of the dc magnetic susceptibility chi and of the Na-23 nuclear magnetic resonance (NMR) response of NaVGe2O6, a material in which the V ions form a network of interacting one-dimensional spin S=1 chains. The experiments were made at temperatures between 2.5 and 300 K. The chi(T) data suggest that the formation of the expected low-temperature Haldane phase is intercepted by an antiferromagnetic phase transition at T-N=18 K. The transition is also reflected in the Na-23 NMR spectra and the corresponding spin-lattice relaxation rate T-1 (-1)(T). In the ordered phase, T-1 (-1)(T) decreases by orders of magnitude with decreasing temperature, indicating the formation of a gap of the order of 12 K in the magnetic excitation spectrum.