Type-I superconductivity in ScGa3 and LuGa3 single crystals

Abstract

We present evidence of type-I superconductivity in single crystals of ScGa3 and LuGa3, from magnetization, specific heat, and resistivity measurements: low critical temperatures Tc = 2.1-2.2 K; field-induced secondto first-order phase transition in the specific heat, critical fields less than 240 Oe; and low Ginzburg-Landau coefficients κ approx 0.23 and 0.30 for ScGa3 and LuGa3, respectively, are all traits of a type-I superconducting ground state. These observations render ScGa3 and LuGa3 two of only several type-I superconducting compounds, with most other superconductors being type II (compounds and alloys) or type I (elemental metals and metaloids).

5 pages, 6 figures

References in corpus (3)

• Temperature dependence of the resistance of metallic nanowires (diameter $\ge$ 15 nm): Applicability of Bloch-Grüneisen theorem
• Specific heat and $\mu$SR study on the noncentrosymmetric superconductor LaRhSi3
• Exceptional type-I superconductivity of the layered silver oxide Ag${}_5$Pb${}_2$O${}_6$

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• Influence of pressure on properties of multi-gap type-I superconductor BeAu
• Single Crystal Growth, Transport, and Electronic Band Structure of YCoGa${}_5$
• Controlled Manipulation of Intermediate State in a Type-I Superconductor