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$��$SR study of spin freezing and persistent spin dynamics in NaCaNi$_2$F$_7$
- Publication Year :
- 2018
- Publisher :
- arXiv, 2018.
-
Abstract
- A new pyrochlore compound, NaCaNi$_2$F$_7$, was recently synthesized and has a single magnetic site with spin-1 Ni$^{2+}$. We present zero field (ZF) and longitudinal field (LF) muon spin rotation ($��$SR) measurements on this pyrochlore. Density functional theory (DFT) calculations show that the most likely muon site is located between two fluorine ions, but off-centre. A characteristic F-$��$-F muon spin polarization function is observed at high temperatures where Ni spin fluctuations are sufficiently rapid. The Ni$^{2+}$ 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.
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi...........d9ee0b4a48d77ea116b2e7c69174d2f7
- Full Text :
- https://doi.org/10.48550/arxiv.1806.10970