Physics – Condensed Matter
Scientific paper
1996-11-27
Phys. Rev. B, {54}, 9019 (1996)
Physics
Condensed Matter
Latex file, 3 postscript figures (included)
Scientific paper
10.1103/PhysRevB.54.9019
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.
Chow Kim H.
Dunsiger S. R.
Gaulin Bruce D.
Gingras Michel J. -P.
Greedan John E.
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