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: A single-crystal high-temperature pyrochlore antiferromagnet

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

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Abstract: We report the magnetic characterization of the frustrated transition metal pyrochlore NaCaCo2F7. This material has high spin Co2+ in CoF6 octahedra in a pyrochlore lattice and disordered nonmagnetic Na and Ca on the large-atom sites in the structure. Large crystals grown by the floating zone method were studied. The magnetic susceptibility is isotropic; the Co moment is larger than the spin-only value; and in spite of the large Curie Weiss theta (140 K), freezing of the spin system, as characterized by peaks in the ac and dc susceptibility and specific heat, does not occur until around 2.4 K. This yields a frustration index of f=CW/Tf 56, an indication that the system is highly frustrated. The observed entropy loss at the freezing transition is low, indicating that magnetic entropy remains present in the system at 0.6 K. The compound may be the realization of a frustrated pyrochlore antiferromagnet with weak bond disorder. The high magnetic interaction strength, strong frustration, and the availability of large single crystals makes NaCaCo2F7 an interesting alternative to rare earth oxide pyrochlores for the study of geometric magnetic frustration in pyrochlore lattices. © 2014 American Physical Society.
Publication Date: Jun-2014
Electronic Publication Date: 2-Jun-2014
Citation: Krizan, J.W., Cava, R.J. (2014). : A single-crystal high-temperature pyrochlore antiferromagnet. Physical Review B, 89 (21), 10.1103/PhysRevB.89.214401, 1-5.
DOI: doi:10.1103/PhysRevB.89.214401
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 89.21:214401-1 - 214401-5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Physical Review B - Condensed Matter and Materials Physics. Volume 89, Issue 21, 2 June 2014, Article number 214401.

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