NMR and dc-susceptibility studies of NaVGe2O6

Details NMR and dc-susceptibility studies of NaVGe2O6 NMR and dc-susceptibility studies of NaVGe2O6

2004-02-18

arxiv.org/abs/cond-mat/0402482v2

Physical Review B70, 024421 (2004)

Physics

Condensed Matter

Other Condensed Matter

10 pages, 15 figures; v2 with minor revisions of the text

Scientific paper

10.1103/PhysRevB.70.024421

We report the results of measurements of the dc magnetic susceptibility chi(T) and of the 23Na 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 18 K. The transition is also reflected in the 23Na NMR spectra and the corresponding spin-lattice relaxation rate 1/T1(T). In the ordered phase, 1/T1(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.

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