Magnetic density of states at low energy in geometrically frustrated systems.
Phys Rev Lett
; 95(4): 047203, 2005 Jul 22.
Article
em En
| MEDLINE
| ID: mdl-16090837
ABSTRACT
Using muon-spin-relaxation measurements we show that the pyrochlore compound Gd(2)Ti(2)O(7), in its magnetically ordered phase below approximately 1 K, displays persistent spin dynamics down to temperatures as low as 20 mK. The characteristics of the induced muon relaxation can be accounted for by a scattering process involving two magnetic excitations, with a density of states characterized by an upturn at low energy and a small gap depending linearly on the temperature. We propose that such a density of states is a generic feature of geometrically frustrated magnetic materials.
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MEDLINE
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En
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Phys Rev Lett
Ano de publicação:
2005
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Article