Quantum Griffiths Phase in the weak itinerant ferromagnetic alloy Ni${}_{1-x}$V${}_x$

Abstract

We present magnetization ($M$) data of the $d$-metal alloy Ni${}_{1-x}$V${}_x$ at vanadium concentrations close to $x_c\approx 11.4$ where the onset of long-range ferromagnetic (FM) order is suppressed to zero temperature. Above $x_c$, the temperature ($T$) and magnetic field ($H$) dependencies of the magnetization are best described by simple nonuniversal power laws. The exponents of $M/H\sim T^{-\gamma }$ and $M\sim H^{\alpha }$ are related by $1-\gamma =\alpha$ for wide temperature ($10K<T\le 300K$) and field ($H\le 5T$) ranges. $\gamma$ is strongly $x$ dependent, decreasing from 1 at $x\approx x_c$ to $\gamma <0.1$ for x=15%. This behavior is not compatible with either classical or quantum critical behavior in a clean 3D FM. Instead it closely follows the predictions for a quantum Griffiths phase associated with a quantum phase transition in a disordered metal. Deviations at the lowest temperatures hint at a freezing of large clusters and the onset of a cluster glass phase, presumably due to RKKY interactions in this alloy.

4 pages, 4 pdf figures included, final version as published.

References in corpus (10)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Rare region effects at classical, quantum, and non-equilibrium phase transitions
• Kondo-Cluster-Glass State near a Ferromagnetic Quantum Phase Transition
• Quantum Griffiths effects in itinerant Heisenberg magnets
• Effects of dissipation on a quantum critical point with disorder
• Infinite-randomness quantum critical points induced by dissipation
• Theory of smeared quantum phase transitions
• Spin-fluctuation dominated electrical transport of Ni3Al at high pressure
• Absence of conventional quantum phase transitions in itinerant systems with disorder
• Local defect in a magnet with long-range interactions

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