NaCaN i2 F7: A frustrated high-temperature pyrochlore antiferromagnet with S=1 N i2+

J. W. Krizan, R. J. Cava

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Abstract

NaCaNi2F7 is an insulating, frustrated A2B2F7 pyrochlore with magnetic S=1Ni2+ on the pyrochlore B site. Nonmagnetic Na and Ca are disordered on the A site. Magnetic susceptibility measurements made on an oriented single crystal, grown in a floating zone furnace, show isotropic behavior at temperatures between 5 and 300K, with an effective moment of 3.7μB/Ni. Despite displaying a large Curie-Weiss theta (-129K), spin-ordering-related features are not seen in the susceptibility or specific heat until a spin glass transition at 3.6K. This yields an empirical frustration index of f=-θCW/Tf≈36. The spin glass behavior is substantiated by a shift of the freezing temperature with frequency in the ac susceptibility, bifurcation in the dc susceptibility, and by a broad maximum in the magnetic specific heat. The observations as made on large single crystals suggest that NaCaNi2F7 is likely a realization of a frustrated spin 1 pyrochlore antiferromagnet with weak bond disorder.

Original languageEnglish (US)
Article number014406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number1
DOIs
StatePublished - Jul 7 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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