Enhanced Superconductivity up to 43 K by P/Sb Doping of Ca1-xLaxFeAs2

Abstract

The effects of isovalent doping on the superconducting transition temperature Tc in novel 112-type iron arsenide Ca1-xLaxFeAs2 were studied by conducting measurements of electrical resistivity rho and magnetization M. P or Sb doping strongly enhances Tc: P-doped Ca0.84La0.16FeAs2 and Sb-doped Ca0.85La0.15FeAs2 exhibited Tc of 41 and 43 K, respectively, while Ca0.85La0.15FeAs2 without P/Sb exhibited Tc = 35 K. These observations will give a hint for further enhancing Tc of rare-earth doped Ca-Fe-As systems.

3 pages, 2 figures

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• Doping-Enhanced Antiferromagnetism in Ca1-xLaxFeAs2
• Significant contribution of As 4p orbitals to the low-lying electronic structure of 112-type iron-based superconductor Ca0.9La0.1FeAs2
• Anisotropic Superconductivity of Ca1-xLaxFeAs2 (x ~ 0.18) Single Crystal
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• Superconductivity and Dirac Fermions in 112-phase Pnictides
• Separation of antiferromagnetism and high-temperature superconductivity in Ca${}_{1-x}$La${}_x$Fe${}_2$As${}_2$ under pressure
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• Dependences on RE of Superconducting Properties of Transition Metal co-doped (Ca,RE)FeAs2 with RE = La-Gd
• Various arsenic network structures in 112-type Ca1-xLaxFe1-yPdyAs2 revealed by synchrotron x-ray diffraction experiments
• Effects of post-annealing and cobalt co-doping on superconducting properties of (Ca,Pr)Fe2As2 single crystals
• Nonlinear and time-resolved optical study of the 112-type iron-based superconductor parent Ca${}_{1-x}$La${}_x$FeAs${}_2$ across its structural phase transition
• First-principle study of antimony doping effects on the iron-based superconductor CaFe(Sb${}_x$As${}_{1-x}$)${}_2$
• Pressure-Induced Superconductivity from Doping-Induced Antiferromagnetic Phase of 112-type Ca${}_{1-x}$La${}_x$FeAs${}_2$