Quantum critical point in the itinerant ferromagnet Ni${}_{1-x}$Rh${}_x$

Abstract

We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline Ni${}_{1-x}$Rh${}_x$ alloys. Through magnetization and muon spin relaxation measurements, we show that the ferromagnetic ordering temperature is suppressed continuously to zero at $x_{crit}=0.375$ while the magnetic volume fraction remains 100% up to $x_{crit}$, pointing to a second order transition. Non-Fermi liquid behavior is observed close to $x_{crit}$, where the electronic specific heat $C_{el}/T$ diverges logarithmically, while immediately above $x_{crit}$ the volume thermal expansion coefficient ${\alpha }_V/T$ and the Grüneisen ratio $\Gamma ={\alpha }_V/C_{el}$ both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in Ni${}_{1-x}$Rh${}_x$.

arXiv comment15 pages, 4 figures

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• Evolution of short-range magnetic correlations in ferromagnetic Ni-V alloys
• Non-Fermi-liquid behavior in a ferromagnetic heavy fermion system CeTi${}_{1-x}$V${}_x$Ge${}_3$
• Hyperscaling analysis of a disorder-induced ferromagnetic quantum critical point in Ni${}_{1-x}$Rh${}_x$ with $x=0.375$
• Magnetic properties of binary alloys Ni1-xMox and Ni1-yCuy close to critical concentrations