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

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

2010-06-21

arxiv.org/abs/1006.4094v2

J. Phys.: Condens. Matter 23, 094205 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1088/0953-8984/23/9/094205

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.

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