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Phys. Rev. Lett. 95, 047203 (2005) [4 pages]

Magnetic Density of States at Low Energy in Geometrically Frustrated Systems

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A. Yaouanc1, P. Dalmas de Réotier1, V. Glazkov1, C. Marin1, P. Bonville2, J. A. Hodges2, P. C. M. Gubbens3, S. Sakarya3, and C. Baines4
1CEA/DSM/Département de Recherche Fondamentale sur la Matière Condensée, 38054 Grenoble, France
2CEA/DSM/Département de Recherche sur l’Etat Condensée, les Atomes et les Molécules, 91191 Gif sur Yvette, France
3Department of Radiation, Radionuclides & Reactors, Delft University of Technology, 2629 JB Delft, The Netherlands
4Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland

Received 4 February 2005; published 22 July 2005

Using muon-spin-relaxation measurements we show that the pyrochlore compound Gd2Ti2O7, in its magnetically ordered phase below ∼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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.047203
DOI:
10.1103/PhysRevLett.95.047203
PACS:
75.40.Gb, 76.75.+i
 
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