Ferromagnetic quantum critical point in URhGe doped with Ru

Abstract

We have investigated the thermal, transport and magnetic properties of URh${}_{1-x}$Ru${}_x$Ge alloys near the critical concentration $x_{cr}=0.38$ for the suppression of ferromagnetic order. The Curie temperature vanishes linearly with $x$ and the ordered moment $m_0$ is suppressed in a continuous way. At $x_{cr}$ the specific heat varies as $c\sim TlnT$, the $\gamma$-value $c/T{|}_{0.5K}$ is maximum and the temperature exponent of the resistivity $\rho \sim T^n$ attains a minimum value $n=1.2$. These observations provide evidence for a ferromagnetic quantum phase transition. Interestingly, the coefficient of thermal expansion and the Grüneisen parameter $\Gamma$ remain finite at $x_{cr}$ (down to $T=1$ K), which is at odds with recent scaling results for a metallic quantum critical point.

5 pages; accepted for publication in Phys. Rev. B

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• Evolution of ferromagnetic and non-Fermi liquid state with doping:the case of Ru doped UCoGe
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• Search for quantum criticality in a ferromagnetic system UNi1-xCoxSi2
• Evidence for a ferromagnetic quantum critical point in URhGe doped with Ru
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