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.

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