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APS » Journals » Phys. Rev. B » Volume 54 » Issue 13
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Phys. Rev. B 54, 9019–9022 (1996)

Muon spin relaxation investigation of the spin dynamics of geometrically frustrated antiferromagnets Y2Mo2O7 and Tb2Mo2O7

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S. R. Dunsiger
Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada V6T-1Z1

R. F. Kiefl
Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada V6T 1Z1
Canadian Institute for Advanced Research, University of British Columbia, Vancouver, Canada V6T-1Z1

K. H. Chow
Clarendon Laboratory, Oxford University, Parks Road, Oxford, OX1 3PU, United Kingdom

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

M. J. P. Gingras
TRIUMF, 4004 Wesbrook Mall, Vancouver, Canada, V6T 2A3

J. E. Greedan
Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1

A. Keren, K. Kojima, and G. M. Luke
Department of Physics, Columbia University, New York, New York 10027

W. A. MacFarlane
Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada V6T 1Z1

N. P. Raju
Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1

J. E. Sonier
Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada V6T 1Z1

Y. J. Uemura and W. D. Wu
Department of Physics, Columbia University, New York, New York 10027

Received 28 June 1996; published in the issue dated 1 October 1996

The spin dynamics of geometrically frustrated pyrochlore antiferromagnets Y2Mo2O7 and Tb2Mo2O7 have been investigated using muon spin relaxation. A dramatic slowing down of the moment fluctuations occurs as one approaches the spin freezing temperatures (TF=22 and 25 K, respectively) from above. Below TF there is a disordered magnetic state similar to that found in a spin glass but with a residual muon spin relaxation rate at low temperatures. These results show that there is a large density of states for magnetic excitations in these systems near zero energy. © 1996 The American Physical Society.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.54.9019
DOI:
10.1103/PhysRevB.54.9019
PACS:
75.50.Ee, 76.75.+i
 
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