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Muon spin relaxation investigation of the spin dynamics of geometrically frustrated antiferromagnets Y 2 Mo …

1996; American Physical Society; Volume: 54; Issue: 13 Linguagem: Inglês

10.1103/physrevb.54.9019

ISSN

1095-3795

Autores

S. R. Dunsiger, R. F. Kiefl, K. H. Chow, B. D. Gaulin, Michel J. P. Gingras, John E. Greedan, Amit Keren, Kenji Kojima, G. M. Luke, W. A. MacFarlane, N. P. Raju, J. E. Sonier, Y. J. Uemura, W. D. Wu,

Tópico(s)

earthquake and tectonic studies

Resumo

The spin dynamics of geometrically frustrated pyrochlore antiferromagnets Y2Mo2O7 and Tb2Mo2O7 have been investigated using muon spin relaxation. A dramatic slowing down of the moment fluctuations occurs as one approaches the spin freezing temperatures (TF=22 K and 25 K respectively) from above. Below TF there is a disordered magnetic state similar to that found in a spin glass but with a residual muon spin relaxation rate at low temperatures. These results show that there is a large density of states for magnetic excitations in these systems near zero energy.

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