Iron-based oxypnictides substituted with yttrium have been prepared via a conventional solid state reaction. The product after first 50 hours of reaction showed diamagnetic-like transition at around 10 K but was not superconducting, while additional 72 hours of high temperature heat treatment was required to yield superconducting sample which was doped with fluoride. Temperature dependence of the susceptibility shows both screening and Meissner effect at around 10 K, while resistance as a function of temperature displayed a drop at around the same temperature.
@article{arxiv.0808.0288,
title = {Superconductivity in Yttrium Iron Oxyarsenide System},
author = {S V Chong and T Mochiji and K Kadowaki},
journal= {arXiv preprint arXiv:0808.0288},
year = {2009}
}
Comments
4 pages, 4 figures, Journal of Physics: Conference Series (Proceedings in the LT25 Low Temperature Physics Conference), Accepted