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S. R. Dunsiger; J. S. Gardner; J. A. Chakhalian; A. L. Cornelius; M. Jaime; R. F. Kiefl; R. Movshovich; W. A. MacFarlane; R. I. Miller; J. E. Sonier; B. D. Gaulin

doi:10.1103/PhysRevLett.85.3504

Low Temperature Spin Dynamics of the Geometrically Frustrated Antiferromagnetic Garnet ${Gd}_{3} {Ga}_{5} O_{12}$

S. R. Dunsiger, J. S. Gardner, J. A. Chakhalian, A. L. Cornelius, M. Jaime, R. F. Kiefl, R. Movshovich, W. A. MacFarlane, R. I. Miller, J. E. Sonier, and B. D. Gaulin

Phys. Rev. Lett. 85, 3504 – Published 16 October 2000

Abstract

The low temperature spin dynamics of the geometrically frustrated antiferromagnet $Gd_{3} Ga_{5} O_{12}$ (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.

Received 19 November 1999

DOI:https://doi.org/10.1103/PhysRevLett.85.3504

Authors & Affiliations

S. R. Dunsiger¹, J. S. Gardner^2,*, J. A. Chakhalian¹, A. L. Cornelius³, M. Jaime⁴, R. F. Kiefl^1,5, R. Movshovich⁴, W. A. MacFarlane^1,†, R. I. Miller¹, J. E. Sonier^1,‡, 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

^*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.