Effects of chemical disorder in the itinerant antiferromagnet Ti${}_{1-x}$V${}_x$Au

Abstract

The fragile nature of itinerant magnetism can be exploited using non-thermal parameters to study quantum criticality. The recently discovered quantum critical point (QCP) in the Sc-doped (hole-like doping) itinerant antiferromagnet TiAu (Ti${}_{1-x}$Sc${}_x$Au) raised questions about the effects of the crystal and electronic structures on the overall magnetic behavior. In this study, doping with V (electron-like doping) in Ti${}_{1-x}$V${}_x$Au introduces chemical disorder which suppresses antiferromagnetic order from $T_{\mathrm{N}}=$ 36~K for $x=0$ down to 10 K for $x=$ 0.15, whereupon a solubility limit is reached. Signatures of non-Fermi-liquid behavior are observed in transport and specific heat measurements similar to Ti${}_{1-x}$Sc${}_x$Au, even though Ti${}_{1-x}$V${}_x$Au is far from a QCP for the accessible compositions $x\le 0.15$.