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

Author(s): Krizan, Jason W.; Cava, Robert Joseph

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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. © 2015 American Physical Society.
Publication Date: Jul-2015
Electronic Publication Date: 7-Jul-2015
Citation: Krizan, JW, Cava, RJ. (2015). : A frustrated high-temperature pyrochlore antiferromagnet with. Physical Review B, 92 (1), 10.1103/PhysRevB.92.014406
DOI: doi:10.1103/PhysRevB.92.014406
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 92.1:014406-1 -014406-6
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. This is an open access article.
Notes: Physical Review B - Condensed Matter and Materials Physics. Volume 92, Issue 1, 7 July 2015, Article number 014406.

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