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arXiv · 1005.3172

Superconductivity induced by doping Rh in CaFe2-xRhxAs2

Yanpeng Qi·Lei Wang·Zhaoshun Gao·Dongliang Wang·Xianping Zhang·Chunlei Wang·Chao Yao·Yanwei Ma
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Abstract

In this paper we report the synthesis of iron-based superconductors CaFe2-xRhxAs2 using one-step solid state reaction method, which crystallizes in the ThCr2Si2-type structure with a space group I4/mmm. The systematic evolution of the lattice constants demonstrates that the Fe ions are successfully replaced by the Rh. By increasing the doping content of Rh, the spin-density-wave (SDW) transition in the parent compound is suppressed and superconductivity emerges. The maximum superconducting transition temperature is found at 18.5 K with the doping level of x = 0.15. The temperature dependence of DC magnetization confirms superconducting transitions at around 15 K. The general phase diagram was obtained and found to be similar to the case of Rh-doping Sr122 system. Our results explicitly demonstrate the feasibility of inducing superconductivity in Ca122 compounds by higher d-orbital electrons doping, however, different Rh-doping effect between FeAs122 compounds and FeAs1111 systems still remains an open question.

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Yanpeng Qi, Lei Wang, Zhaoshun Gao, Dongliang Wang, Xianping Zhang, Chunlei Wang, Chao Yao, Yanwei Ma. 2011-03-29. Superconductivity induced by doping Rh in CaFe2-xRhxAs2. https://doi.org/10.1088/1367-2630%2F13%2F3%2F033020

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