Coexistence of superconductivity and ferromagnetism in Sr0.5Ce0.5FBiS2

Abstract

Through the combination of X-ray diffraction, electrical transport, magnetic susceptibility, and the heat capacity measurements, we studied the effect of Ce doping in the newly discovered SrFBiS$2$ system. It is found that Sr$0.5$Ce$0.5$FBiS$2$ undergoes a second-order transition below $7.5 K, followed by a superconducting transition with the critical temperature Tc=2.8 K. Our transport, specific heat and DC-magnetization results suggest the presence of bulk ferromagneticcorrelation of Ce ion below 7.5 K that coexist with superconductivity when the temperature is further lowered below 2.8 K.

arXiv comment6 pages, 5 figures

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• Bulk Superconductivity Induced by Se Substitution in BiCh2-Based Layered Compounds Eu0.5Ce0.5FBiS2-xSex
• Coexistence of superconductivity and complex 4$f$ magnetism in Eu${}_{0.5}$Ce${}_{0.5}$BiS${}_2$F
• Role of valence changes and nanoscale atomic displacements in BiS2-based superconductors
• Mn-doping induced ferromagnetism and enhanced superconductivity in Bi_4-x Mn_x O_4 S_3 (0.075 < = x < = 0.15)
• Superconductivity and abnormal pressure effect in Sr0.5La0.5FBiSe2 superconductor
• Superconductivity in La1-xSmxO0.5F0.5BiS2 (x = 0.2, 0.8) under hydrostatic pressure
• Evidence of a pseudogap driven by competing orders of multi-band origin in the ferromagnetic superconductor Sr${}_{0.5}$Ce${}_{0.5}$FBiS${}_2$
• Evolution of two bulk-superconducting phases in Sr0.5RE0.5FBiS2 (RE: La, Ce, Pr, Nd, Sm) by external hydrostatic pressure effect