Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-04-17
Phys. Rev. B 75 (2007) 212405-1:4.
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages; accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.75.212405
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 Gr\"uneisen 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.
Gasparini Alice
Huy Nguyen Thanh
Klaasse J. C. P.
Sakarya Serhat
van Dijk N. H.
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