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

• Published in: Frontiers of physics 2017-08, Vol.12 (4), p.167-172, Article 127401
• Main Authors: Xing, Xiang-Zhuo, Zhou, Wei, Xu, Chun-Qiang, Zhou, Nan, Yuan, Fei-Fei, Zhang, Yu-Feng, Xu, Xiao-Feng, Shi, Zhi-Xiang
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Antimony; Astronomy; Astrophysics and Cosmology; Atomic; Condensed Matter Physics; Crystals; Doping; Electrical resistivity; Electrons; Fermi liquids; Magnetic fields; Molecular; Optical and Plasma Physics; Particle and Nuclear Physics; Phase diagrams; Physics; Physics and Astronomy; Research Article; Single crystals; Superconductivity; Transport properties
• ISSN: 2095-0462; 2095-0470
• DOI: 10.1007/s11467-016-0621-2

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.