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 $x\le 0.15$.

References in corpus (9)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Rare region effects at classical, quantum, and non-equilibrium phase transitions
• Metallic Quantum Ferromagnets
• Quantum Phase Transitions in the Itinerant Ferromagnet ZrZn${}_2$
• Quantum Griffiths Phase in the weak itinerant ferromagnetic alloy Ni${}_{1-x}$V${}_x$
• Absence of conventional quantum phase transitions in itinerant systems with disorder
• Novel Itinerant Antiferromagnet TiAu
• Disorder promotes ferromagnetism: Rounding of the quantum phase transition in Sr_{1-x}Ca_xRuO_3
• On the critical behavior of disordered quantum magnets: The relevance of rare regions