Probing the magnetic phases in the Ni-V alloy close to the disordered ferromagnetic quantum critical point with muSR

Abstract

Zero (ZF) and longitudinal field (LF) muon spin relaxation data of the {\it d}-metal alloy Ni${}_{1-x}$V${}_x$ are presented at several vanadium concentrations $x$ below and above the critical $x_c\approx 11$% where long-range ferromagnetic (FM) order is suppressed. The clear single precession frequency observed for Ni, as expected for a homogeneous FM, changes to rather damped oscillation with small V substitution at $x=4$%, confirming magnetic inhomogeneities caused by the less magnetic V environments in the magnetic Ni matrix. Furthermore, local fields and spatial field distributions can be estimated to characterize different inhomogeneous regimes developing with $x$ in the FM phase of Ni${}_{1-x}$V${}_x$. In the regime of $x=7-10$% a Kubo Toyabe function well describes the low temperature ZF and LF asymmetry data supporting a static Gaussian field distribution. Closer to the quantum critical concentration a single scale static Kubo Toyabe function with one field distribution is not sufficient to describe the muon relaxation. These data indicate that further changes in spatial distributions and dynamics are evolving as expected within the critical regime of a disordered quantum critical point.

arXiv comment6 pages, 4 figures, submitted to Proceedings of The 13th International Conference on Muon Spin Rotation, Relaxation and Resonance (similar to published article)

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Cited by in corpus (6)

• Metallic Quantum Ferromagnets
• Quantum Griffiths phase inside the ferromagnetic phase of Ni${}_{1-x}$V${}_x$
• Magnetic order of intermetallic FeGa${}_{3-y}$Ge${}_y$ studied by $\mu$SR and ${}^{57}$Fe Mössbauer spectroscopy
• Effect of disorder on a pressure-induced $z=1$ magnetic quantum phase transition
• Evidence for magnetic clusters in Ni${}_{1-x}$V${}_x$ close to the quantum critical concentration
• Evolution of short-range magnetic correlations in ferromagnetic Ni-V alloys