New Fe-based superconductor S doped FeTe using nontoxic elements

Discovery of Fe-based new superconductor was received with considerable surprise. The Fe based-superconductor is expected to be a new series of high-Tc superconductors such as cuprate High-Tcs. However, one of the demerit of Fe based-superconductor is that it contains toxic element of As or Se. So, new Fe based- superconductors composed of nontoxic elements were required. Recently, we have discovered S doped FeTe as a new superconductor using nontoxic elemtns. Its superconductong transition temperature is around 10K and the upper critical fields is ~70T. This material has merit for superconducting applications.