Journal of Low Temperature Physics

, Volume 99, Issue 3–4, pp 359–361 | Cite as

Quantum fluctuations in structurally disordered antiferrromagnets

  • K. Retzlaff
  • J. Richter


We present exact diagonalisation data for the ground state of finite two-dimensional spin 1/2 Heisenberg antiferromagnets with structural disorder. The combination of antiferromagnetic coupling and structural disorder creates frustation and a local singlet formation which may strongly influence the magnetic ordering. In detail we study the magnetic radial distribution function, the magnetic order parameter M2 as well as a parameter measuring the spin misfit and present these quantities in dependence on the strength of the structural disorder. We estimate the critical disorder where the antiferromagnetic long-range order breaks down.

PACS numbers

75.10.Jm 75.50.Ee 71.55.Jv 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    E. Manousakis, Rev. Mod. Phys.63, 1 (1991)Google Scholar
  2. 2.
    J. Richter, Phys. Rev. B47, 5794 (1993)Google Scholar
  3. 3.
    A. W. Sandvik and M. Vekic, SISSA/cond-mat/9406025 (1994)Google Scholar
  4. 4.
    R. N. Bhatt, P. A. Lee, Phys. Rev. Lett.48, 344 (1982); J. Appl. Phys.52, 1703 (1982)Google Scholar
  5. 5.
    S.-k. Ma, C. Dasgupta, C.-k. Hu, Phys. Rev. B22, 1434 (1979)Google Scholar
  6. 5a.
    B. Keimer et al., Phys. Rev. Lett.67, 1930 (1991)Google Scholar
  7. 5b.
    S. M. Hayden et al., Phys. Rev. Lett.66, 821 (1991)Google Scholar
  8. 5c.
    C. Broholm et al., Phys. Rev. Lett.65, 3173 (1991)Google Scholar
  9. 5d.
    W. Wu, B. Ellman, T. Rosenbaum, G. Aeppli, D. H. Reich, Phys. Rev. Lett67, 2076 (1991)Google Scholar
  10. 5e.
    S. Sachdev, J. Ye, Phys. Rev. Lett.69, 2411 (1992)Google Scholar
  11. 6.
    S. Kobe, K. Handrich 1976 Phys. Status Solidi b73, K65Google Scholar
  12. 6a.
    J. Richter, S. Kobe, J. Phys. C:Solid State Phys.,15, 2193 (1982)Google Scholar
  13. 6b.
    J. Richter, S. Kobe, H. Wonn, Phys. Stat. Sol. B98, K37 (1982)Google Scholar
  14. 7.
    H. Schulz, T. A. L. Ziman, Europhys. Lett.18, 7891 (1991)Google Scholar
  15. 7a.
    H. J. Schulz, T. A. L. Ziman, D. Poilblanc, SISSA/cond-mat/9402061 (1994)Google Scholar

Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • K. Retzlaff
    • 1
  • J. Richter
    • 1
  1. 1.Institute for Theoretical PhysicsUniversity MagdeburgGermany

Personalised recommendations