Figure (IMAGE) Science China Press Caption The illustration of the protonation setup (left), the proton NMR spectra of a Hx-FeSe0.93S0.07 single crystal at different temperatures (top right), and the ac susceptibility of the same sample as a function of temperature (bottom right). Credit ©Science China Press Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.