^31P NMR investigations on the ferromagnetic quantum critical system YbNi_4P_2

Abstract

We studied the new heavy-fermion system YbNi${}_4$P${}_2$, which presents strong ferromagnetic correlations, using the local ${}^{31}$P NMR probe over a wide field (0.2-8.6 \textsf{T}) and temperature (1.8-200 K) range. ${}^{31}$P NMR Knight shift provides the static spin susceptibility which tracks the bulk susceptibility whereas the spin-lattice relaxation rate ${}^{31}(1/T_1$) provide information about the fluctuations of the Yb 4f moment. The Korringa law is valid over a wide range in temperature and field. The Korringa product ${}^{31}(1/T_{1}T{K}^2$S${}_0$) $\ll$ 1 gives evidence for the presence of strong ferromagnetic correlations. Over two decades in temperature a ${}^{31}(1/T_{1}T)\sim T^{-3/4}$ behaviour was found.

5 pages, 4 figures

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• Magnetic order and spin dynamics across a ferromagnetic quantum critical point: $\mu$SR investigations of YbNi${}_4$(P${}_{1-x}$As${}_x$)${}_2$
• Nearly ferromagnetic metal state in the collapsed tetragonal phase of YFe${}_2$(Ge,Si)${}_2$
• Evolution of magnetic fluctuations through the Fe-induced paramagnetic to ferromagnetic transition in Cr${}_2$B
• Competing magnetic correlations across the ferromagnetic quantum critical point in the Kondo system CeTi${}_{1-x}$V${}_x$Ge${}_3$: ${}^{51}$V NMR as a local probe