Signatures of a quantum Griffiths phase in a d-metal alloy close to its ferromagnetic quantum critical point

Abstract

We report magnetization ($M$) measurements close to the ferromagnetic quantum phase transition of the d-metal alloy Ni${}_{1-x}$V${}_x$ at a vanadium concentration of $x_c\approx 11.4$. In the diluted regime ($x>x_c$), the temperature ($T$) and magnetic field ($H$) dependencies of the magnetization are characterized by nonuniversal power laws and display $H/T$ scaling in a wide temperature and field range. The exponents vary strongly with $x$ and follow the predictions of a quantum Griffiths phase. We also discuss the deviations and limits of the quantum Griffiths phase as well as the phase boundaries due to bulk and cluster physics.

4 pages, 5 figures, final version as published in the Strongly Correlated Electron Systems special issue of J. Phys. Condens. Matter

References in corpus (7)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Rare region effects at classical, quantum, and non-equilibrium phase transitions
• Quantum Griffiths effects and smeared phase transitions in metals: theory and experiment
• 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
• Absence of conventional quantum phase transitions in itinerant systems with disorder

Cited by in corpus (5)

• Theory of Scanning Tunneling Spectroscopy: from Kondo Impurities to Heavy Fermion Materials
• Probing the magnetic phases in the Ni-V alloy close to the disordered ferromagnetic quantum critical point with muSR
• Evidence for magnetic clusters in Ni${}_{1-x}$V${}_x$ close to the quantum critical concentration
• Quantum-critical properties of the one- and two-dimensional random transverse-field Ising model from large-scale quantum Monte Carlo simulations
• Quantum Monte Carlo study of the bond- and site-diluted transverse-field Ising model