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Spin freezing in the disordered pyrochlore magnet NaCaCo2 F7: NMR studies and Monte Carlo simulations

Author(s): Sarkar, Rajib; Krizan, Jason W.; Brückner, Felix; Andrade, Eric C.; Rachel, Stephan; et al

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Abstract: © 2017 American Physical Society. We present results of Na23 and F19 nuclear magnetic resonance (NMR) measurements on NaCaCo2F7, a frustrated pyrochlore magnet with a Curie-Weiss temperature ΘCW≈-140 K and intrinsic bond disorder. Below 3.6 K both the Na23 and F19 spectra broaden substantially in comparison to higher temperatures accompanied by a considerable reduction (80%) of the NMR signal intensity: This proves a broad quasistatic field distribution. The F19 spin-lattice relaxation rate 19(1/T1) exhibits a peak at 2.9 K already starting to develop below 10 K. We attribute the spin freezing to the presence of bond disorder. This is corroborated by large-scale Monte Carlo simulations of a classical bond-disordered XY model on the pyrochlore lattice. The low freezing temperature, together with the very short magnetic correlation length not captured by the simulations, suggests that quantum effects play a decisive role in NaCaCo2F7.
Publication Date: 15-Dec-2017
Electronic Publication Date: 12-Dec-2017
Citation: Sarkar, R., Krizan, J.W., Brückner, F., Andrade, E.C., Rachel, S., Vojta, M., Cava, R.J., Klauss, H.H. (2017). Spin freezing in the disordered pyrochlore magnet NaCaCo2 F7: NMR studies and Monte Carlo simulations. Physical Review B, 96 (23), 10.1103/PhysRevB.96.235117
DOI: doi:10.1103/PhysRevB.96.235117
ISSN: 2469-9950
EISSN: 2469-9969
Pages: 96.23:235117-1 - 235117-10
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. Volume 96, Issue 23, 12 December 2017, Article number 235117.

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