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 \kappa = 0.05, together with typical magnetization isotherms of type I superconductors, small critical field values, a strong Differential Paramagnetic Effect (DPE) signal, and a field-induced change from second to first order phase transition, confirm the type I nature of the superconductivity in YbSb2. A possible second superconducting state is observed in the radiofrequency (RF) susceptibility measurements, with Tc(2)≈ 0.41 K and Hc(2)≈ 430 Oe.
@article{arxiv.1202.4772,
title = {Type I Superconductivity in YbSb2 Single Crystals},
author = {Liang L. Zhao and Stefan Lausberg and H. Kim and M. A. Tanatar and Manuel Brando and R. Prozorov and E. Morosan},
journal= {arXiv preprint arXiv:1202.4772},
year = {2012}
}