We report the first experimental observation of superconductivity in Cd3As2 thin films without application of external pressure. Surface studies suggest that the observed transport characteristics are related to the polycrystalline continuous part of investigated films with homogeneous distribution of elements and the Cd-to-As ratio close to stoichiometric Cd3As2. The latter is also supported by Raman spectra of the studied films, which are similar to those of Cd3As2 single crystals. The formation of superconducting phase in films under study is confirmed by the characteristic behavior of temperature and magnetic field dependence of samples resistances, as well as by the presence of pronounced zero-resistance plateaux in dV/dI characteristics. The corresponding Hc−Tc plots reveal a clearly pronounced linear behavior within the intermediate temperature range, similar to that observed for bulk Cd3As2 and Bi2Se3 films under pressure, suggesting the possibility of nontrivial pairing in the films under investigation. We discuss a possible role of sample inhomogeneities and crystal strains in the observed phenomena.
@article{arxiv.1811.06133,
title = {Observation of sub-kelvin superconductivity in Cd$_3$As$_2$ thin films},
author = {A. V. Suslov and A. B. Davydov and L. N. Oveshnikov and L. A. Morgun and K. I. Kugel and V. S. Zakhvalinskii and E. A. Pilyuk and A. V. Kochura and A. P. Kuzmenko and V. M. Pudalov and B. A. Aronzon},
journal= {arXiv preprint arXiv:1811.06133},
year = {2019}
}