Magnetic order and spin dynamics in the proximity of a ferromagnetic quantum critical point: A μSR study of YbNi4P2

Abstract

The local 4f-electronic spin dynamics and magnetic order in YbNi4P2 were studied by means of muon-spin relaxation measurements. Zero-field muon-spin relaxation proves static magnetic order with a strongly reduced ordered Yb3+ moment of (2.5-4.6) \times 10-2μB, below TC = 140 mK. Above TC, the muon-spin polarization P(t,B) is dominated by quasihomogeneous spin fluctuations and exhibits a time-field scaling relation P(t,B) = P(t/Bγ), indicating cooperative critical spin dynamics in the system. At T = 190 mK, slightly above TC, γ = 0.81(5), suggesting time-scale invariant power-law behavior for the dynamic electronic spin-spin autocorrelation function.

5 pages, 4 figures

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• Spin-selective Kondo insulator: Cooperation of ferromagnetism and Kondo effect
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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${}_x$)${}_2$
• Magnetic order of intermetallic FeGa${}_{3-y}$Ge${}_y$ studied by $\mu$SR and ${}^{57}$Fe Mössbauer spectroscopy
• Anomalous quantum-critical spin dynamics in YFe2Al10
• Quantum Criticality and Inhomogeneous Magnetic Order in Fe-doped alpha-YbAlB4