Geometrical frustration in the ferromagnetic pyrochlore Ho2Ti2O7

M.J. Harris, S.T. Bramwell, D.F. McMorrow, T. Zeiske, K.W. Godfrey

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    Abstract

    We report a detailed study of the pyrochlore Ho2Ti2O7, in which the magnetic ions (Ho3+) are ferromagnetically coupled with J similar to 1 K. We show that the presence of local Ising anisotropy leads to a geometrically frustrated ground state, preventing long-range magnetic order down to at least 0.05 K. However, unlike in the case of a frustrated antiferromagnet, this disorder is principally static. In a magnetic field, the ground-state degeneracy is broken and ordered magnetic phases are formed which display an unusual history dependence due to the slow dynamics of the system. These results represent the first experimental evidence for geometrical frustration in a ferromagnetic system.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume79
    Issue number13
    Pages (from-to)2554-2557
    ISSN0031-9007
    DOIs
    Publication statusPublished - 1997

    Cite this

    Harris, M. J., Bramwell, S. T., McMorrow, D. F., Zeiske, T., & Godfrey, K. W. (1997). Geometrical frustration in the ferromagnetic pyrochlore Ho2Ti2O7. Physical Review Letters, 79(13), 2554-2557. https://doi.org/10.1103/PhysRevLett.79.2554