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29 March 2024
 
  » arxiv » cond-mat/0606150

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Quenching of the Haldane gap in LiVSi2O6 and related compounds
B. Pedrini ; S. Wessel ; J. L. Gavilano ; H. R. Ott ; S. M. Kazakov ; J. Karpinski ;
Date 6 Jun 2006
Subject Strongly Correlated Electrons
AbstractWe report results of susceptibility chi and 7Li 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.
Source arXiv, cond-mat/0606150
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