Temperature Dependence (IMAGE) Science China Press Caption Temperature dependence of direct-current magnetic susceptibility, which is a measure of superconducting volume fraction, for CsEuFe4As4. (b) Temperature dependence of the specific-heat capacity, confirming bulk nature of the two transitions at 15.5 and 35.2 K. (c) Crystal structure of (Rb/Cs)EuFe4As4 consisting of alternate Eu, FeAs, Rb/Cs and FeAs layers along the c axis. (b) Field-dependent magnetization curves indicating coexistence of superconductivity and ferromagnetism in CsEuFe4As4. 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.