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EPR and NMR characterization of theS=9 excited state and spin density distribution in the single-molecule magnet Fe8Br8: Implications to theS=10 model and magnetization tunneling pathways

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Abstract

High-sensitivity, variable-frequency, high-field electron paramagnetic resonance (EPR) measurements and nuclear magnetic resonance (NMR) measurements are reported for theS=10 single-molecule magnet Fe8Br8. We find that theS=10 state is nested with its first excited state, withS=9, located at only 24±2 K above. Also reported are some preliminary81Br NMR measurements of the unpaired electron spin density on the Br− sites. The results provide new insight and benchmarks for improved electronic and magnetic structural calculations and macroscopic tunneling pathways of this class of single-molecule magnets.

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry and National High Magnetic Field Laboratory, Florida State University, 32306-4390, Tallahassee, FL, USA

    D. Zipse, N. S. Dalal, R. M. Achey & J. M. North

  2. Department of Physics, University of Florida, Gainesville, Florida, USA

    S. Hill & R. S. Edwards

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  1. D. Zipse
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  2. N. S. Dalal
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  3. R. M. Achey
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  4. J. M. North
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  5. S. Hill
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  6. R. S. Edwards
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Zipse, D., Dalal, N.S., Achey, R.M. et al. EPR and NMR characterization of theS=9 excited state and spin density distribution in the single-molecule magnet Fe8Br8: Implications to theS=10 model and magnetization tunneling pathways. Appl. Magn. Reson. 27, 151–163 (2004). https://doi.org/10.1007/BF03166310

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  • DOI: https://doi.org/10.1007/BF03166310

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