Ferromagnetic quantum critical point in URhGe doped with Ru
| Autor: | Huy, N. T., Gasparini, A., Klaasse, J. C. P., de Visser, A., Sakarya, S., van Dijk, N. H. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 75 (2007) 212405-1:4. |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.75.212405 |
| Popis: | 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. Comment: 5 pages; accepted for publication in Phys. Rev. B |
| Databáze: | arXiv |
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