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The weak itinerant ferromagnetic behavior of Y$_2$Ni$_7$ is investigatedthrough magnetic, transport and calorimetric measurements. The low value ofsaturation moment, large Rhodes-Wohlfarth ratio, large value of the linear termin heat capacity and Fermi liquid like resistivity behavior with enhancedelectron-electron scattering contribution establish firmly the weak itinerantferromagetic nature of the sample. The critical exponents associated with theparamagnetic to ferromagnetic transition are also investigated frommagnetization isotherms using modified Arrott plot, Kouvel-Fisher plot andcritical isotherm technique. The more accurate Kouvel-Fisher plot provides thecritical exponents to be $\beta$ = 0.306, $\gamma$ = 1.401 and $\delta$ =5.578. These values are markedly different from the mean field values andcorrespond closely to the two dimensional Ising spin system with long rangespin spin interaction.

Investigation of weak itinerant ferromagnetism and critical behavior of Y$_2$Ni$_7$