Realization of random-field Ising ferromagnetism in a molecular magnet

Bo Wen, P. Subedi, Lin Bo, Y. Yeshurun, M. P. Sarachik, A. D. Kent, A. J. Millis, C. Lampropoulos, G. Christou

    Research output: Contribution to journalArticle

    Abstract

    The longitudinal magnetic susceptibility of single crystals of the molecular magnet Mn12 -acetate obeys a Curie-Weiss law, indicating a transition to a ferromagnetic phase at ∼0.9 K. With increasing magnetic field applied transverse to the easy axis, a marked change is observed in the temperature dependence of the susceptibility, and the suppression of ferromagnetism is considerably more rapid than predicted by mean-field theory for an ordered single crystal. Our results can instead be fit by a Hamiltonian for a random-field Ising ferromagnet in a transverse magnetic field, where the randomness derives from the intrinsic distribution of locally tilted magnetic easy axes known to exist in Mn12 -acetate crystals, suggesting that Mn12 -acetate is a realization of the random-field Ising model in which the random field may be tuned by a field applied transverse to the easy axis.

    Original languageEnglish (US)
    Article number014406
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume82
    Issue number1
    DOIs
    StatePublished - Jul 8 2010

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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  • Cite this

    Wen, B., Subedi, P., Bo, L., Yeshurun, Y., Sarachik, M. P., Kent, A. D., Millis, A. J., Lampropoulos, C., & Christou, G. (2010). Realization of random-field Ising ferromagnetism in a molecular magnet. Physical Review B - Condensed Matter and Materials Physics, 82(1), [014406]. https://doi.org/10.1103/PhysRevB.82.014406