Static Critical Behavior of the Spin-Freezing Transition in the Geometrically Frustrated Pyrochlore Antiferromagnet Y2Mo2O7
Abstract
Some frustrated pyrochlore antiferromagnets, such as Y2Mo2O7, show a spin-freezing transition and magnetic irreversibilities below a temperature Tf similar to what is observed in randomly frustrated spin-glasses. We present results of nonlinear dc magnetization measurements on Y2Mo2O7 that provide strong evidence that there is an underlying thermodynamic phase transition at Tf, which is characterized by critical exponents γ~2.8 and β~0.8. These values are typical of those found in random spin-glasses, despite the fact that the level of random disorder in Y2Mo2O7 is immeasurably small.
- Publication:
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Physical Review Letters
- Pub Date:
- February 1997
- DOI:
- arXiv:
- arXiv:cond-mat/9611121
- Bibcode:
- 1997PhRvL..78..947G
- Keywords:
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- Condensed Matter - Disordered Systems and Neural Networks
- E-Print:
- Latex file, calls for 4 encapsulated postscript figures (included). Submitted to Phys. Rev. Letters.