μsR study of spin freezing and persistent spin dynamics in NaCaNi2F7

Y. Cai, M. N. Wilson, A. M. Hallas, L. Liu, B. A. Frandsen, S. R. Dunsiger, J. W. Krizan, R. J. Cava, O. Rubel, Y. J. Uemura, G. M. Luke

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1 Scopus citations

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.

Original languageEnglish (US)
Article number385802
JournalJournal of Physics Condensed Matter
Volume30
Issue number38
DOIs
StatePublished - Aug 29 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • NaCaNiF
  • frustrated magnetic
  • pyrochlore
  • spin dynamics
  • μSR

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