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Simultaneous suppression of ferromagnetism and superconductivity in UCoGe by Si substitution

D. E. de Nijs, N. T. Huy, and A. de Visser
Phys. Rev. B 77, 140506(R) – Published 29 April 2008
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    Abstract

    We investigate the effect of substituting Si for Ge in the ferromagnetic superconductor UCoGe. dc-magnetization, ac-susceptibility, and electrical resistivity measurements on polycrystalline UCoGe1−xSix samples show that ferromagnetic order and superconductivity are progressively depressed with increasing Si content and simultaneously vanish at a critical concentration xcr≃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.

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    • Received 11 February 2008

    DOI:https://doi.org/10.1103/PhysRevB.77.140506

    ©2008 American Physical Society

    Authors & Affiliations

    D. E. de Nijs, N. T. Huy, and A. de Visser*

    • Van der Waals–Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands

    • *devisser@science.uva.nl

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    Issue

    Vol. 77, Iss. 14 — 1 April 2008

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    Images

    • Figure 1
      Figure 1
      (Color online) Left panel: magnetization as a function of field for UCoGe1−xSix alloys at T=2K. Si concentrations are (from top to bottom) x=0, 0.02, 0.05, 0.08, 0.10, 0.14, and 1.0. The solid lines represent fits to Eq. (1) for x≤0.10. Right panel: spontaneous magnetization Ms(0) as a function of Si content.Reuse & Permissions
    • Figure 2
      Figure 2
      (Color online) Temperature variation of the ac susceptibility (SI units) of UCoGe1−xSix alloys for x=0.00, 0.04, 0.06, and 0.14. The inset shows χac around the ferromagnetic transition for 0.00≤x≤0.20. The data for x=0.20 fall on the horizontal axis.Reuse & Permissions
    • Figure 3
      Figure 3
      Left panel: the electrical resistivity ρ (arbitrary units) plotted versus Tn of UCoGe1−xSix alloys for x as indicated. The curves are shifted along the vertical axis for clarity. The straight solid lines represent fits ρ∼Tn (see text). Right panel: exponent n versus Si concentration. The dashed line serves as a guide for the eyes. The vertical dotted line locates xcr. The horizontal dotted line indicates n=2.Reuse & Permissions
    • Figure 4
      Figure 4
      (Color online) Curie temperature, determined by M(T) (★) and χac(T) (◼), and superconducting transition temperature, determined by ρ(T) (●) and χac(T) (▲), as a function of x for UCoGe1−xSix alloys. The dashed lines serve as a guide for the eyes. Superconductivity and ferromagnetism both vanish at xcr≃0.12.Reuse & Permissions
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