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NMR and dc-susceptibility studies of NaVGe2O6 | | B. Pedrini
; J. L. Gavilano
; D. Rau
; H. R. Ott
; S. M. Kazakov
; J. Karpinski
; S. Wessel
; | | Date: |
18 Feb 2004 | | Journal: | Physical Review B70, 024421 (2004) DOI: 10.1103/PhysRevB.70.024421 | | Affiliation: | Lab. fuer Festkoerperphysik ETH-Zurich, Intitut fuer Theoretische Physik ETH-Zurich | | Abstract: | 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. | | Source: | arXiv, cond-mat/0402482 | | Services: | Forum | Review | PDF | Favorites | |
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