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

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

2000-05-19

arxiv.org/abs/cond-mat/0005316v1

Phys. Rev. B 62, R755 (2000)

Physics

Condensed Matter

Statistical Mechanics

9 pages, 2 Postscript figures, Phys. Rev. B: Rapid, in press

Scientific paper

10.1103/PhysRevB.62.R755

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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