Quenching of the Haldane gap in LiVSi2O6 and related compoundsстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Quenching of the haldane gap in livsi2o6 and related compounds / B. Pedrini, S. Wessel, J. L. Gavilano et al. // European Physical Journal B. — 2007. — Vol. 55, no. 3. — P. 219–228. We report results of susceptibility chi and Li-7 NMR measurements on LiVSi2O6. The temperature dependence of the magnetic susceptibility chi(T) exhibits a broad maximum, typical for low-dimensional magnetic systems. Quantitatively it is in agreement with the expectation for an S=1 spin chain, represented by the structural arrangement of V ions. The NMR results indicate antiferromagnetic ordering below T-N=24 K. The intra- and interchain coupling J and J(p) for LiVSi2O6, and also for its sister compounds LiVGe2O6, NaVSi2O6 and NaVGe2O6, are obtained via a modified random phase approximation which takes into account results of quantum Monte Carlo calculations. While J(p) is almost constant across the series, J varies by a factor of 5, decreasing with increasing lattice constant along the chain direction. The comparison between experimental and theoretical susceptibility data suggests the presence of an easy-axis magnetic anisotropy, which explains the formation of an energy gap in the magnetic excitation spectrum below T-N, indicated by the variation of the NMR spin-lattice relaxation rate at T << T-N. [ DOI ]

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