Physics – Condensed Matter – Superconductivity
Scientific paper
2008-04-11
Phys. Rev. B 77, 140506(R) (2008)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures, accepted for publication in PRB
Scientific paper
10.1103/PhysRevB.77.140506
We investigate the effect of substituting Si for Ge in the ferromagnetic superconductor UCoGe. Dc-magnetization, ac-susceptibility and electrical resistivity measurements on polycrystalline UCoGe$_{1-x}$Si$_x$ samples show that ferromagnetic order and superconductivity are progressively depressed with increasing Si content and simultaneously vanish at a critical concentration $x_{cr} \simeq 0.12$. The non-Fermi liquid temperature variation in the electrical resistivity near $x_{cr}$ and the smooth depression of the ordered moment point to a continuous ferromagnetic quantum phase transition. Superconductivity is confined to the ferromagnetic phase, which provides further evidence for magnetically mediated superconductivity.
de Nijs D. E.
Huy Nguyen Thanh
Visser Anne de
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