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Muon spin relaxation investigation of frustrated antiferromagnetic pyrochlores A2B2O7

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Abstract

In a system where magnetic ions occupy the vertices of edge or corner sharing triangular units, the natural antiferromagnetic coupling between ions is geometrically frustrated. A wide variety of interesting magnetic behaviour has been observed in pyrochlores, where magnetic ions form a network of corner sharing tetrahedra. The low temperature spin dynamics of a number of pyrochlores A2B2O7 have been investigated using the technique of μ SR. For example, Y2Mo2O7 shows a transition to a disordered magnetic state similar to a spin glass at TF=22 K. However, unlike conventional metallic spin glasses, a non‐zero muon spin depolarization rate is observed to persist well below 0.1\ TF. These results suggest that there is a finite density of states for magnetic excitations in this system near zero energy.

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Authors and Affiliations

  1. Department of Physics and Astronomy, University of British Columbia, Canada, V6T 1Z1

    S.R. Dunsiger, R.F. Kiefl, W.A. MacFarlane & J.E. Sonier

  2. Canadian Institute for Advanced Research, University of British Columbia, Canada, V6T 1Z1

    R.F. Kiefl

  3. Clarendon Laboratory, Oxford University, Parks Road, Oxford, OX1 3PU, UK

    K.H. Chow

  4. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada, L8S 4M1

    B.D. Gaulin

  5. TRIUMF, 4004 Wesbrook Mall, Vancouver, Canada, V6T 2A3

    M.J.P. Gingras

  6. Department of Chemistry, McMaster University, Hamilton, Ontario, Canada, L8S 4M1

    J.E. Greedan & N.P. Raju

  7. Department of Physics, Columbia University, New York, NY, 10027, USA

    A. Keren, K. Kojima, G.M. Luke, Y.J. Uemura & W.D. Wu

Authors
  1. S.R. Dunsiger
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  2. R.F. Kiefl
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  3. K.H. Chow
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  4. B.D. Gaulin
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  5. M.J.P. Gingras
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  6. J.E. Greedan
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  7. A. Keren
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  8. K. Kojima
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  9. G.M. Luke
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  10. W.A. MacFarlane
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  11. N.P. Raju
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  12. J.E. Sonier
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  13. Y.J. Uemura
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  14. W.D. Wu
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Dunsiger, S., Kiefl, R., Chow, K. et al. Muon spin relaxation investigation of frustrated antiferromagnetic pyrochlores A2B2O7 . Hyperfine Interactions 104, 275–280 (1997). https://doi.org/10.1023/A:1012656600206

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  • DOI: https://doi.org/10.1023/A:1012656600206

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