Structural study of superconducting sulfur hydride under high pressure

Superconductivity exceeding 200 K was recently reported in the highly compressed hydrogen sulfide [1]. The superconductor was found to be synthesized by pressure above 90 GPa under low temperature exceeding 200 K. Here we report our high-pressure structural studies for H$_{2}$S and D$_{2}$S using a synchrotron x-ray at room temperature and low temperature [2]. The sample at 10 GPa was firstly cooled down to 200 K and compressed up to 150 GPa, then cooled down to 10 K. The resistivity and diffraction patterns were monitored at all procedures. The critical temperature and zero resistivity were confirmed. The x-ray diffraction data in both cells showed good agreement with the theoretically predicted structures [3].