Muon spin relaxation investigation of frustrated antiferromagnetic pyrochlores A2B2O7 |
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| Authors: | SR Dunsiger RF Kiefl KH Chow BD Gaulin MJP Gingras JE Greedan A Keren K Kojima GM Luke WA MacFarlane NP Raju JE Sonier YJ Uemura WD Wu |
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| Institution: | (1) Department of Physics and Astronomy, University of British Columbia, Canada, V6T 1Z1;(2) Canadian Institute for Advanced Research, University of British Columbia, Canada, V6T 1Z1;(3) Clarendon Laboratory, Oxford University, Parks Road, Oxford, OX1 3PU, UK;(4) Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada, L8S 4M1;(5) TRIUMF, 4004 Wesbrook Mall, Vancouver, Canada, V6T 2A3;(6) Department of Chemistry, McMaster University, Hamilton, Ontario, Canada, L8S 4M1;(7) Department of Physics, Columbia University, New York, NY 10027, USA |
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| Abstract: | In a system where magnetic ions occupy the vertices of edge or corner sharing triangular units, the natural antiferromagnetic
coupling between ions is geometrically frustrated. A wide variety of interesting magnetic behaviour has been observed in pyrochlores,
where magnetic ions form a network of corner sharing tetrahedra. The low temperature spin dynamics of a number of pyrochlores
A2B2O7 have been investigated using the technique of μ SR. For example, Y2Mo2O7 shows a transition to a disordered magnetic state similar to a spin glass at TF=22 K. However, unlike conventional metallic spin glasses, a non‐zero muon spin depolarization rate is observed to persist
well below 0.1\ TF. These results suggest that there is a finite density of states for magnetic excitations in this system near zero energy.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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