Observation of the anisotropic spin-glass transition and transverse spin ordering in pseudo-brookite through muon spin relaxation |
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| Authors: | C. Boekema V. A. M. Brabers R. L. Lichti A. B. Denison D. W. Cooke R. H. Heffner R. L. Hutson M. E. Schillaci D. E. Maclaughlin S. A. Dodds |
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| Affiliation: | (1) San José State University, 95192 San José, CA, USA;(2) University of Technology, Eindhoven, Netherlands;(3) Texas Tech University, Lubbock, TX, USA;(4) University of Wyoming, Laramie, WY, USA;(5) Los Alamos National Laboratory, Los Alamos, NM, USA;(6) University of California, Riverside, CA, USA;(7) Rice University, Houston, TX, USA |
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| Abstract: | Zero-field longitudinal muon-spin-relaxation (μSR) experiments have been performed on single crystals of pseudo-brookite (Fe2−xTil+x O 5; x=0.25), an anisotropic spin-glass system. The spinglass temperature (Tg) is determined to be 44.0±0.5K. Above Tg, a distinct exponential muon-spin-relaxation rate (λ) is observed, while below Tg a square-root exponential decay is seen, indicating fast spin fluctuations in the ‘frozen’ state. Near 8K, a maximum in λ is observed, which is due to transverse spin ordering at these low temperatures. Even near Tg, λ is very low (<1 μs−1), likely due to a well-defined muon-oxygen state in the single crystals. The sharp λ-increase (with decreasing temperatures) above Tg allows a comparison between spinfreezing models like the Vogel-Fulcher law and a power law. The results of these initial measurements indicate that dynamic (and static) magnetism in oxide spin glasses can be directly monitored through μSR. |
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