Phase diagram and transport properties of Sb-doped Ca_{lus-plus">0.88}La_{lus-plus">0.12}Fe_lus-plus">2As_lus-plus">2 single crystals

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• 作者：Xiang-Zhuo Xing ; Wei Zhou ; Chun-Qiang Xu ; Nan Zhou ; Fei-Fei Yuan…
• 关键词：Sb doped Ca0.88La0.12Fe2As2 superconductors ; electrical resistivity measurement ; phase diagram
• 刊名：Frontiers of Physics
• 出版年：2017
• 出版时间：August 2017
• 年：2017
• 卷：12
• 期：4
• 全文大小：1,026 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-0470
• 卷排序：12

文摘

The effects of isovalent Sb substitution on the superconducting properties of the Ca_0.88La_0.12Fe₂(As_1-ySb_y)₂ system have been studied through electrical resistivity measurements. It is seen that the antiferromagnetic or structural transition is suppressed with Sb content, and a high-T_c superconducting phase, accompanied by a low-T_c 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-T_c phase. With further Sb doping, this high-T_c phase abruptly vanishes for y > 0.06 and the conventional Fermi liquid is restored, while the low-T_c phase remains robust against Sb impurities. The coincidence of the high-T_c 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-T_c phase in this system.