@article{928b8b7ad4124ff9a8dcfe0a1a023043,
title = "μsR study of spin freezing and persistent spin dynamics in NaCaNi2F7 ",
abstract = "A new pyrochlore compound, NaCaNi2F7, was recently synthesized and has a single magnetic site with spin-1 Ni2+. We present zero field and longitudinal field muon spin rotation (μSR) measurements on this pyrochlore. Density functional theory calculations show that the most likely muon site is located between two fluorine ions, but off-centre. A characteristic F-μ-F muon spin polarization function is observed at high temperatures where Ni spin fluctuations are sufficiently rapid. The Ni2+ spins undergo spin freezing into a disordered ground state below 4 K, with a characteristic internal field strength of 140 G. Persistent Ni spin dynamics are present to our lowest temperatures (75 mK), a feature characteristic of many geometrically frustrated magnetic systems.",
keywords = "NaCaNiF, frustrated magnetic, pyrochlore, spin dynamics, μSR",
author = "Y. Cai and Wilson, {M. N.} and Hallas, {A. M.} and L. Liu and Frandsen, {B. A.} and Dunsiger, {S. R.} and Krizan, {J. W.} and Cava, {R. J.} and O. Rubel and Uemura, {Y. J.} and Luke, {G. M.}",
note = "Funding Information: Work at Princeton was supported by the US Department of Energy, Division of Basic Energy Sciences, through the Institute for Quantum Matter, grant DE-FG02-08ER46544. Work of the Columbia group has been supported by NSF DMR-1436095 (DMREF) and NSF DMR-1610633, and Reimei Project of Japan Atomic Energy Agency. The DFT calculations were performed using computational resources of the Thunder Bay Regional Research Institute, Lakehead University, and Compute Canada (Calcul Quebec). Funding Information: We greatly appreciate useful discussions with Wen Huang. We also greatly appreciate the support of personnel at TRIUMF during the μSR measurements. Work at Princeton was supported by the US Department of Energy, Division of Basic Energy Sciences, through the Institute for Quantum Matter, grant DE-FG02-08ER46544. Work of the Columbia group has been supported by NSF DMR-1436095 (DMREF) and NSF DMR-1610633, and Reimei Project of Japan Atomic Energy Agency. The DFT calculations were performed using computational resources of the Thunder Bay Regional Research Institute, Lakehead University, and Compute Canada (Calcul Quebec). Funding Information: Work at McMaster (G M Luke, O Rubel) was supported by the Natural Sciences and Engineering Research Council of Canada. Publisher Copyright: {\textcopyright} 2018 IOP Publishing Ltd.",
year = "2018",
month = aug,
day = "29",
doi = "10.1088/1361-648X/aad91c",
language = "English (US)",
volume = "30",
journal = "Journal of Physics Condensed Matter",
issn = "0953-8984",
publisher = "IOP Publishing Ltd.",
number = "38",
}