Superconductivity induced by doping Rh in CaFe2-xRh xAs2 Article

cited authors

  • Qi, Y; Wang, L; Gao, Z; Wang, D; Zhang, X; Wang, C; Yao, C; Ma, Y

fiu authors

abstract

  • In this paper, we report the synthesis of iron-based superconductors CaFe2?xRhxAs2 using a one-step solid state reaction method that 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 18.5K with a 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 the Rh-doping Sr122 system. Our results explicitly demonstrate the feasibility of inducing superconductivity in Ca122 compounds by higher d-orbital electron doping; however, different Rh-doping effects between FeAs122 compounds and FeAs1111 systems still remains an open question. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

publication date

  • March 1, 2011

Digital Object Identifier (DOI)

volume

  • 13