Phase diagram and transport properties of Sb-doped Ca0.88La0.12Fe2As2 single crystals

作     者：Xiang-Zhuo Xing Wei Zhou Chun-Qiang Xu Nan Zhou Fei-Fei Yuan Yu-Feng Zhang Xiao-Feng Xu Zhi-Xiang Shi 

作者机构：Department of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 211189 China Department of Physics and Hangzhou Key Laboratory of Quantum Matters Hangzhou Normal University Hangzhou 310036 China 

出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)

年 卷 期：2017年第12卷第4期

页      面：167-172页

核心收录：

学科分类：07[理学] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：This work was supported by tile National Natural Science Foundation of China (Grant Nos. U1432135  11674054  11474080  and 11611140101) and the Scientific Research Foundation of Graduate School of Southeast University (Grant No. YBJJ1621). X. Xu would also like to acknowledge the National Key Basic Research Program of China (Grant No. 2014CB648400) and the support from the Distinguished Young Scientist Funds of Zhejiang Province (No. LR14A040001) 

主　　题：Sb doped Ca0.88La0.12Fe2As2 superconductors electrical resistivity measurement phase diagram 

摘      要：The effects of isovalent Sb substitution on the superconducting properties of the Ca0.88La0.12Fe2（As1-ySby）2 system have been studied through electrical resistivity measure- ments. It is seen that the antiferromagnetic or structural transition is suppressed with Sb content, and a high-To superconducting phase, accompanied by a low-Tc phase, emerges at 0.02 ≤y ≤ 0.06. In this intermediate-doping regime, normal-state transport shows non-Fermi-liquid-like behaviors with nearly T-linear resistivity above the high-Tc phase. With further Sb doping, this high-Tc phase abruptly vanishes for y 〉 0.06 and the conventional Fermi liquid is restored, while the low-T,, phase remains robust against Sb inlpurities. The coincidence of the high-Tc phase and non-Fermi liquid transport behaviors in the intermediate Sb-doping regime suggests that AFM fluctuations play an important role in the observed non-Fermi liquid behaviors, which may be intimately related to the unusual nonbulk high-Tc phase in this system.