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APS » Journals » Phys. Rev. Lett. » Volume 85 » Issue 16
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Phys. Rev. Lett. 85, 3504–3507 (2000)

Low Temperature Spin Dynamics of the Geometrically Frustrated Antiferromagnetic Garnet Gd3Ga5O12

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S. R. Dunsiger1, J. S. Gardner2,*, J. A. Chakhalian1, A. L. Cornelius3, M. Jaime4, R. F. Kiefl1,5, R. Movshovich4, W. A. MacFarlane1,†, R. I. Miller1, J. E. Sonier1,‡, and B. D. Gaulin2
1Department of Physics and Astronomy, University of British Columbia, Canada V6T 1Z1
2Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
3Department of Physics, University of Nevada-Las Vegas, 4505 Maryland Parkway, Box 454002, Las Vegas, Nevada 89154-4002
4Los Alamos National Laboratory, K764, Los Alamos, New Mexico 87545
5TRIUMF, 4004 Wesbrook Mall, Vancouver, Canada V6T 2A3

Received 19 November 1999; published in the issue dated 16 October 2000

The low temperature spin dynamics of the geometrically frustrated antiferromagnet Gd3Ga5O12 (GGG) have been investigated using muon spin relaxation. No evidence for static order is seen down to a temperature of 25 mK or a few percent of the Curie-Weiss temperature. Instead there is a linear decrease in the Gd spin fluctuation rate below 1 K which extrapolates to a small but finite value of 2 GHz at zero temperature. In terms of the spin fluctuations the system appears essentially to remain dynamic at low temperatures (T>0.02 K) and magnetic fields up to 1.8 T.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.3504
DOI:
10.1103/PhysRevLett.85.3504
PACS:
75.50.Lk, 75.50.Ee, 76.75.+i

*Present address: Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0.

†Present address: Department of Physics, University of Toronto, Ontario, Canada M5S 1A7.

‡Present address: Los Alamos National Laboratory, K764, Los Alamos, New Mexico 87545.

 
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