We study by means of bulk and local probes the d-metal alloy Ni1-xVx close to the quantum critical concentration, xc ≈ 11.6%, where the ferromagnetic transition temperature vanishes. The magnetization-field curve in the ferromagnetic phase takes an anomalous power-law form with a nonuniversal exponent that is strongly x dependent and mirrors the behavior in the paramagnetic phase. Muon spin rotation experiments demonstrate inhomogeneous magnetic order and indicate the presence of dynamic fluctuating magnetic clusters. These results provide strong evidence for a quantum Griffiths phase on the ferromagnetic side of the quantum phase transition.
R. Wang et al., "Quantum Griffiths Phase Inside the Ferromagnetic Phase of Ni₁₋ₓVₓ," Physical Review Letters, vol. 118, no. 26, American Physical Society (APS), Jun 2017.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.118.267202
Center for High Performance Computing Research
Keywords and Phrases
Binary alloys; Ferromagnetic materials; Ferromagnetism; Lanthanum compounds; Nickel alloys; Phase transitions, Ferromagnetic phase; Ferromagnetic transition temperatures; Magnetic cluster; Magnetic orders; Muon spin rotation; Paramagnetic phase; Quantum critical; Quantum phase transitions, Quantum theory
International Standard Serial Number (ISSN)
Article - Journal
© 2017 American Physical Society (APS), All rights reserved.
01 Jun 2017
This work was supported by the National Science Foundation (NSF) under Grant No. DMR-1506152 and by Engineering and Physical Sciences Research Council (EPSRC) (UK).