Superconductivity induced by doping Rh in CaFe2-xRhxAs2

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.

15 pages, 6 figures

References in corpus (22)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• The superconductivity at 18 K in LiFeAs system
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Superconductivity at 25 K in hole doped $(L{a}_{1-x}S{r}_x)OFeAs$
• Determination of the phase diagram of the electron doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Transition of stoichiometricSr2VO3FeAs to a superconducting state at 37.2 K
• First order structural phase transition in CaFe${}_2$As${}_2$
• Superconductivity at 17 K in (Fe2P2)(Sr4Sc2O6): a new superconducting layered pnictide oxide with a thick perovskite oxide layer
• Different resistivity response to spin density wave and superconductivity at 20 K in $C{a}_{1-x}N{a}_{x}F{e}_{2}A{s}_2$
• Synthesis and Properties of CaFe${}_2$As${}_2$ Single Crystals
• Superconductivity and phase diagrams in 4d- and 5d-metal-doped iron arsenides SrFe_{2-x}M_xAs_2 (M = Rh, Ir, Pd)
• The B -> D* l nu form factor at zero recoil from three-flavor lattice QCD: A model independent determination of |V_cb|
• Anisotropic magnetic and superconducting properties of pure and Co-doped CaFe${}_2$As${}_2$ single crystals
• Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2
• SU(2) and SU(3) chiral perturbation theory analyses on baryon masses in 2+1 flavor lattice QCD
• Superconductivity in Co-doped SmFeAsO
• Superconductivity induced by doping Ru in SrFe2-xRuxAs2
• Superconductivity in SmFe1-xMxAsO (M = Co, Rh, Ir)
• Phase diagram of the NdFe1-xRhxAsO superconductor

Cited by in corpus (4)

• Superconductivity in Iron Compounds
• Synthesis and properties of La-doped CaFe2As2 single crystals with Tc = 42.7 K
• Transport properties and anisotropy in rare earth doped CaFe2As2 single crystals with Tc above 40 K
• Single crystal growth and superconductivity of Ca(Fe1-xCox)2As2