Co-doping effects on magnetism and superconductivity in the 112-type EuFeAs2 system

作     者：Jia Yu Tong Liu BinBin Ruan Kang Zhao QingSong Yang MengHu Zhou ZhiAn Ren Jia Yu;Tong Liu;BinBin Ruan;Kang Zhao;QingSong Yang;MengHu Zhou;ZhiAn Ren

作者机构：Institute of Physics and Bejing National Laboratory for Condensed Matter PhysicsChinese Academy of SciencesBejing 100190China School of Physical SciencesUniversity of Chinese Academy of SciencesBejing 100049China Songshan Lake Materials LaboratoryDongguan 523808China School of PhysicsSun Yat-sen UniversityGuangzhou 510275China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2021年第64卷第6期

页      面：98-105页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.11774402) the National Key Research Program of China(Grant Nos.2018YFA0704200,and 2016YFA0300301) 

主　　题：EuFeAs_(2) iron-based superconductors superconductivity magnetism 

摘      要：The discovery of EuFeAs_(2),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 polycrystalline EuFe_(1-y)Co_(y)As_(2)and Eu_(0.9)Pr_(0.1)Fe_(1-y)Co_(y)As_(2)samples are synthesized through solid-state reaction,and the evolutions of SC and magnetism with Co doping in EuFeAs_(2)and Eu_(0.9)Pr_(0.1)FeAs_(2)are investigated by electrical transport and magnetic susceptibility *** EuFe_(1-y)Co_(y)As_(2),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 ***,SC is induced by a trace amount of Co doping,with a highest transition temperature T_(c)~28 K found in EuFe0.9Co0.1As_(2).For the Eu_(0.9)Pr_(0.1)Fe1-yCo_(y)As_(2)series,the magnetism and superconductivity show similar evolutions upon Co doping,and the highest T_(c)is enhanced to 30.6 K with an optimum doping level y~*** results shed light on the competition between SC and SDW with Co doping in the 112-type EuFeAs_(2)system.