Abstract
We present evidence of type-I superconductivity in YbSb${}_{2}$ single crystals from dc and ac magnetization, heat capacity, and resistivity measurements. The critical temperature and critical field are determined to be ${T}_{c}\ensuremath{\approx}$ 1.3 K and ${H}_{c}\ensuremath{\approx}$ 55 Oe. A small Ginzburg-Landau parameter $\ensuremath{\kappa}=$ 0.05, together with typical magnetization isotherms of type-I superconductors, small critical field values, a strong differential paramagnetic effect signal, and a field-induced change from second- to first-order phase transition, confirms the type-I nature of the superconductivity in YbSb${}_{2}$. A possible second superconducting state is observed in the radio-frequency susceptibility measurements, with ${T}_{c}^{(2)}\ensuremath{\approx}$ 0.41 K and ${H}_{c}^{(2)}\ensuremath{\approx}$ 430 Oe.
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