Magnetic density of states at low energy in geometrically frustrated systems

Abstract

Using muon-spin-relaxation measurements we show that the pyrochlore compound Gd2Ti2O7, in its magnetically orderered 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.

5 pages, two figures

References in corpus (1)

• $\mu$SR study of the quantum dynamics in the frustrated $S=3/2$ kagome bilayers

Cited by in corpus (22)

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• Calculation of the Expected Zero Field Muon Relaxation Rate in the Geometrically Frustrated Rare Earth Pyrochlore Gd2Sn2O7 Antiferromagnet
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• Observation of a transverse magnetization in the ordered phases of the pyrochlore magnet Gd2Ti2O7
• Low temperature crystal structure and local magnetometry for the geometrically frustrated pyrochlore Tb2Ti2O7
• Magnetic order, spin waves and fluctuations in the triangular antiferromagnet La2Ca2MnO7
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