LiVGe2O6, an anomalous quasi 1D, $S=1$ system, as revealed by NMR

Abstract

We report the results of ${}^7$Li nuclear magnetic resonance (NMR) studies of LiVGe${}_2$O${}_6$, a quasi one--dimensional spin $S=1$ model system, at low temperatures. Our data, including NMR spectra and the temperature dependence of the spin-lattice relaxation rate $T_1^{-1}$, indicate a first order phase transition to occur at $T_c\simeq 23$ K. The NMR response of LiVGe${}_2$O${}_6$ below $T_c$ suggests that the ordered phase is antiferromagnetic and has unusual features. Possible reasons for this unexpected behavior are discussed.

4 pages, 4 Postscript figures. To appear in Phys. Rev. Lett

References in corpus (1)

• Biquadratic interactions and spin-Peierls transition in the spin 1 chain LiVGe2O6

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