Magnetic properties of binary alloys Ni1-xMox and Ni1-yCuy close to critical concentrations

Abstract

The search for the ferromagnetic quantum critical point (FM QCP) has always been a captivating research topic in the scientific community. In pursuit of this goal, we introduced nonmagnetic transition metals to alloy with elemental nickel, and studied the magnetic properties of nickel binary alloys Ni1-xMox and Ni1-yCuy as a function of x and y up to the critical concentrations x_{cr} and y_{cr} at which the FM transition T_C disappears. T_C-x(y) phase diagrams were constructed via the Arrott-Noakes scaling of magnetization data. An enhanced Sommerfeld coefficient (the value of C/T as T \rightarrow 0) is observed near y_{cr}, manifesting the effect of quantum fluctuations near the quantum phase transition. It is evident that C/T diverges with -logT down to 0.1 K in the vicinity of y_{cr}, suggests the plausible FM QCP in Ni1-yCuy. However, in the case of Ni1-xMox, although the enhancement of the Sommerfeld coefficient is also observed near x_{cr}, the spin glass behavior is identified through the ac magnetic susceptibility measurement. This observation rules out the possibility of the existence of the FM QCP in Ni1-xMox.

The phase diagram figure is distorted during the conversion from jpg tp eps format

References in corpus (11)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Tutorial: A Beginner's Guide to Interpreting Magnetic Susceptibility Data with the Curie-Weiss Law
• Ferromagnetic cluster spin-glass behavior in PrRhSn3
• Ferromagnetic quantum critical point in URhGe doped with Ru
• Disorder dependence of the ferromagnetic quantum phase transition
• Quenched and Annealed Disorder Mechanisms in Comb-Models with Fractional Operators
• Quantum critical point in the itinerant ferromagnet Ni${}_{1-x}$Rh${}_x$
• Quantum critical scaling in the disordered itinerant ferromagnet UCo${}_{1-x}$Fe${}_x$Ge
• Pre-asymptotic critical behavior and effective exponents in disordered metallic quantum ferromagnets
• The influence of magnetic sublattice dilution on magnetic order in CeNiGe3 and UNiSi2
• Hyperscaling analysis of a disorder-induced ferromagnetic quantum critical point in Ni${}_{1-x}$Rh${}_x$ with $x=0.375$