Signatures of a Quantum Griffiths Phase in a D-Metal Alloy Close to Its Ferromagnetic Quantum Critical Point
We report magnetization measurements close to the ferromagnetic quantum phase transition of the d-metal alloy Ni1-xVx at a vanadium concentration of xc ≈ 11.4%. In the diluted regime (x > xc), the temperature (T) and magnetic field (H) dependences 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.
A. Schroeder et al., "Signatures of a Quantum Griffiths Phase in a D-Metal Alloy Close to Its Ferromagnetic Quantum Critical Point," Journal of Physics Condensed Matter, vol. 23, no. 9, Institute of Physics - IOP Publishing, Mar 2011.
The definitive version is available at http://dx.doi.org/10.1088/0953-8984/23/9/094205
Keywords and Phrases
Cluster physics; Griffiths phase; Magnetization measurements; Metal alloys; Power law; Quantum critical points; Quantum phase transitions; Vanadium concentration; Ferromagnetic materials; Ferromagnetism; Magnetic fields; Magnetization; Quantum theory; Vanadium; Phase transitions
International Standard Serial Number (ISSN)
Article - Journal
© 2011 Institute of Physics - IOP Publishing, All rights reserved.