μSR study of spin freezing and persistent spin dynamics in NaCaNi2F7.
作者： A M Hallas , J W Krizan , B A Frandsen , G M Luke , G M Luke
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摘要: A new pyrochlore compound, NaCaNi2F7, was recently synthesized and has a single magnetic site with spin-1 Ni2+ . We present zero field longitudinal muon spin rotation (μSR) measurements on this pyrochlore. Density functional theory calculations show that the most likely is located between two fluorine ions, but off-centre. characteristic F-μ-F polarization function observed at high temperatures where Ni fluctuations are sufficiently rapid. The Ni2+ spins undergo freezing into disordered ground state below 4 K, internal strength of 140 G. Persistent dynamics to our lowest (75 mK), feature many geometrically frustrated systems.
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