Magnetic susceptibility in quasi one-dimensional Baa2V3O9: chain segmentation versus the staggered field effect

  • B. Schmidt
  • V. Yushankhai
  • L. Siurakshina
  • P. Thalmeier
Article

Abstract:

A pronounced Curie-like upturn of the magnetic susceptibility x (T) of the quasi one-dimensional spin chain compound Ba2V3O9 has been found recently [1]. Frequently this is taken as a signature for a staggered field mechanism due to the presence of g-factor anisotropy and Dzyaloshinskii-Moriya interaction. We calculate this contribution within a realistic structure of vanadium 3 d- and oxygen 2p-orbitals and conclude that this mechanism is far too small to explain experimental results. We propose that the Curie term is rather due to a segmentation of spin chains caused by broken magnetic bonds which leads to uncompensated S = ½ spins of segments with odd numbers of spins. Using the finite-temperature Lanczos method we calculate their effective moment and show that ˜ 1% of broken magnetic bonds is sufficient to reproduce the anomalous low-T behavior of x(T) in Ba2V3O9.

PACS. 75.10.Jm Quantized spin models – 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) – 75.50.Ee Antiferromagnetics 

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Copyright information

© EDP Sciences, Springer-Verlag 2003

Authors and Affiliations

  • B. Schmidt
    • 1
  • V. Yushankhai
    • 1
  • L. Siurakshina
    • 2
  • P. Thalmeier
    • 1
  1. 1.Max Planck Institute for the Chemical Physics of SolidsDresdenGermany
  2. 2.Joint Institute for Nuclear ResearchDubnaRussia

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