2008/04/11 by D. E. de Nijs, N. T. Huy, Nguyễn Thanh Huy +1 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.140506
published as Phys. Rev. B 77, 140506(R) (2008) · 5 pages, 4 figures, accepted for publication in PRB
arxiv created 2008/04/11 · openalex publication_date 2008/04/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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\ensuremath-xSix samples show that ferromagnetic order and superconductivity are progressively depressed with increasing Si content and simultaneously vanish at a critical concentration xcr\ensuremath≃0.12. The non-Fermi-liquid temperature variation in the electrical resistivity near xcr 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.