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摘要
A series of K0.8Fe2-xIr (x) Se-2 single-crystal compounds with nominal compositions x = 0, 0.01, 0.03, 0.05, 0.07, and 0.1 were successfully synthesized using self-flux method. It is found that the Ir doping in the present system will induce a suppression of the c-axis lattice constants. However, the zero-resistance temperatures, , are nearly maintained around 32 K for the samples with x a parts per thousand currency sign 0.05, and it drops to 29 K for the one with x = 0.07. The superconductivity vanishes when the doping level reaches to 0.1. The hump in resistivity which corresponds to the transition from the insulating to metallic phase shifts towards low temperatures. However, the magnitude of the normal-state resistivity above 100 K for Ir-doped samples with x a parts per thousand currency sign 0.05 is smaller than the one of the undoped sample, indicating the doping at Fe vacancy site. An onset transition temperature of 44 K has been observed in the rho-T curve for K0.8Fe1.95Ir0.05Se2..
- 出版日期2014-8
- 单位西南交通大学
