Low temperature spin dynamics of the geometrically frustrated antiferromagnetic garnet Gd3Ga5O12

Authors
Dunsiger, SR Gardner, JS Chakhalian, JA Cornelius, AL Jaime, M Kiefl, RF Movshovich, R MacFarlane, WA Miller, RI Sonier, JE Gaulin, BD
Citation
Sr. Dunsiger et al., Low temperature spin dynamics of the geometrically frustrated antiferromagnetic garnet Gd3Ga5O12, PHYS REV L, 85(16), 2000, pp. 3504-3507
Citations number
33
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
85
Issue
16
Year of publication
2000
Pages
3504 - 3507
Database
ISI
SICI code
0031-9007(20001016)85:16<3504:LTSDOT>2.0.ZU;2-J
Abstract
The low temperature spin dynamics of the geometrically frustrated antiferro magnet Gd3Ga5O12 (GGG) have been investigated using muon spin relaxation. N o 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 bu t finite value of 2 GHz at zero temperature. In terms of the spin fluctuati ons the system appears essentially to remain dynamic at low temperatures (T > 0.02 K) and magnetic fields up to 1.8 T.