【摘 要】
：
The discovery of EuFeAs2,currently the only charge-neutral parent phase of the 112-type iron-pnictide system,provides a new platform for the study of elemental doping effects on magnetism and superconductivity (SC).In this study,a series of poly-crystalli
【机 构】
：
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of
【出 处】
：
中国科学：物理学 力学 天文学（英文版）
论文部分内容阅读
The discovery of EuFeAs2,currently the only charge-neutral parent phase of the 112-type iron-pnictide system,provides a new platform for the study of elemental doping effects on magnetism and superconductivity (SC).In this study,a series of poly-crystalline EuFe1-yCoyAs2and Eu0.9Pr0.1Fe1-yCoyAS2 samples are synthesized through solid-state reaction,and the evolutions of SC and magnetism with Co doping in EuFeAs2 and Eu0.9Pr0.1FeAs2 are investigated by electrical transport and magnetic susceptibility measurements.For EuFe1-yCoyAs2,the Eu-related antiferromagnetic (AFM) transition around 40 K is barely affected by Co doping,while the Fe-related spin density wave (SDW) transition temperature drops rapidly.Meanwhile,SC is induced by a trace amount of Co doping,with a highest transition temperature Tc～28 K found in EuFe0.9Co0.1As2.For the Eu0.9Pr0.1Fe1-yCoyAs2 series,the magnetism and superconductivity show similar evolutions upon Co doping,and the highest Tc is enhanced to 30.6 K with an optimum doping level y ～ 0.07.Our results shed light on the competition between SC and SDW with Co doping in the 112-type EuFeAs2 system.
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