Browsing by Author "Zhao, Liang L."

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    Type-I superconductivity in YbSb2 single crystals
    (American Physical Society, 2012) Zhao, Liang L.; Lausberg, Stefan; Kim, H.; Tanatar, M.A.; Brando, Manuel; Prozorov, R.; Morosan, E.
    We present evidence of type-I superconductivity in YbSb2 single crystals from dc and ac magnetization, heat capacity, and resistivity measurements. The critical temperature and critical field are determined to be Tc ≈ 1.3 K and Hc ≈ 55 Oe. A small Ginzburg-Landau parameter κ = 0.05, together with typical magnetization isotherms of type-I superconductors, small critical field values, a strong differential paramagnetic effect signal, and a fieldinduced change from second- to first-order phase transition, confirms the type-I nature of the superconductivity in YbSb2. A possible second superconducting state is observed in the radio-frequency susceptibility measurements, with T (2) c ≈ 0.41 K and H(2) c ≈ 430 Oe.