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Local lattice disorder in the geometrically-frustrated spin glass pyrochlore Y2Mo2O7

C. H. Booth·J. S. Gardner·G. H. Kwei·R. H. Heffner·F. Bridges·M. A. Subramanian
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Abstract

The geometrically-frustrated spin glass Y2Mo2O7 has been considered widely to be crystallographically ordered with a unique nearest neighbor magnetic exchange interaction, J. To test this assertion, we present x-ray-absorption fine-structure results for the Mo and Y K edges as a function of temperature and compare them to results from a well-ordered pyrochlore, Tl2Mn2O7. We find that the Mo-Mo pair distances are significantly disordered at approximately right angles to the Y-Mo pairs. These results strongly suggest that lattice disorder nucleates the spin-glass phase in this material.

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C. H. Booth, J. S. Gardner, G. H. Kwei, R. H. Heffner, F. Bridges, M. A. Subramanian. 2000-05-19. Local lattice disorder in the geometrically-frustrated spin glass pyrochlore Y2Mo2O7. https://doi.org/10.1103/physrevb.62.r755

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