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 x(c) approximate to 11.4%. In the diluted regime (x > x(c)), 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.