Abstract.
We report results of susceptibility χ and 7Li NMR measurements on LiVSi2O6. The temperature dependence of the magnetic susceptibility χ(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 TN=24 K. The intra- and interchain coupling J and Jp 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 Jp 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 TN, indicated by the variation of the NMR spin-lattice relaxation rate at T≪TN.
Similar content being viewed by others
References
F.D.M. Haldane, Phys. Lett. 93A, 464 (1983)
P. Millet, F. Mila, F.C. Zhang, M. Mambrini, A.B. Van-Osten, A. Paschenko, A. Sulpice, A. Stepanov, Phys. Rev. Lett. 83, 4176 (1999)
J.L. Gavilano, S. Mushkolaj, H.R. Ott, P. Millet, F. Mila, Phys. Rev. Lett. 85, 409 (2000)
P. Vonlanthen, K.B. Tanaka, A. Goto, W.G. Clark, P. Millet, J.Y. Henry, J.L. Gavilano, H.R. Ott, F. Mila, C. Berthier, M. Horvatic, Y. Tokunaga, P. Kuhns, A.P. Reyes, W.G. Moulton, Phys. Rev. B 65, 214413 (2002)
B. Pedrini, J.L. Gavilano, D. Rau, H.R. Ott, J.Karpinski, S. Wessel, Phys. Rev. B 70, 024421 (2004)
A.N. Vasiliev, O.L. Ignatchik, M. Isobe, Y. Ueda, Phys. Rev. B 70, 132415 (2004)
C. Satto, P. Millet, J. Galy, Acta Cryst. C 53, 1727 (1997)
G.C. Carter, L.H. Bennett, D.J. Kahan, Metallic Shifts in NMR (Pergamon Press, Oxford, 1977)
J. Barak, A. Gabai, N. Kaplan, Phys. Rev. B 9, 4914 (1974)
H. Chen, L. Yu, Z. Su, Phys. Rev. 186, 291 (1969)
A. Koga, N. Kawakami, Phys. Rev. B 61, 6133 (2000)
Y.J. Kim, Birgenau, R. J. Phys. Rev. B 62, 6378 (2000)
C. Yasuda, S. Todo, K. Hukushima, F. Alet, M. Keller, M. Troyer, Takayama, H. Phys. Rev. Lett. 94, 217201 (2005)
H.J. Schulz, Phys. Rev. Lett. 77, 2790 (1996)
F. Alet, S. Wessel, M. Troyer, Phys. Rev. E 71, 036706 (1999)
A.W. Sandvik, Phys. Rev. B 59, R14157 (1999)
F. Alet, Phys. Soc. Jpn Suppl. 74, 30 (12005)
M. Troyer et al., Lect. Notes Comput. Sci. 1505, 191 (1998)
W. Chen, K. Hida, B.C. Sanctuary, Phys. Rev. B 67, 104401 (2003)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Pedrini, B., Wessel, S., Gavilano, J. et al. Quenching of the Haldane gap in LiVSi2O6 and related compounds. Eur. Phys. J. B 55, 219–228 (2007). https://doi.org/10.1140/epjb/e2007-00056-0
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epjb/e2007-00056-0