Non-Fermi-liquid behavior in a ferromagnetic heavy fermion system CeTi${}_{1-x}$V${}_x$Ge${}_3$

Abstract

An investigation of the thermodynamic and electrical transport properties of the isoelectronic chemical substitution series CeTi${}_{1-x}$V${}_x$Ge${}_3$ (CTVG) single crystals is reported. As x increases, the ferromagnetic (FM) transition temperature is suppressed, reaching absolute zero at the critical concentration x = 0.4, where a non-Fermi-liquid low-temperature specific heat and electrical resistivity, as well as the hyperscaling of specific heat and magnetization are found. Our study clearly identifies an FM quantum critical point (QCP) in CTVG. The obtained critical exponents suggest that CTVG falls in the preasymptotic region of the disorder-tuned FM QCP predicted by the Belitz-Kirkpatrick-Vojta theory.

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