Structural and magnetic phase transitions in triclinic Ca10(FeAs)10(Pt3As8)

Abstract

We report the structural and magnetic phase transitions of triclinic Ca10(FeAs)10(Pt3As8). High-resolution X-ray powder diffraction reveals splitting of the in-plane (a,b) lattice parameters at Ts ~ 120 K. Platinum-doping weakens the distortion and shifts the transition temperature to 80 K in Ca10(Fe1-xPt_xAs)10(Pt3As8) with x = 0.03. muSR experiments show the onset of magnetic order near Ts and a broad magnetic phase transition. No symmetry breaking is associated to the structural transition in Ca10(FeAs)10(Pt3As8) in contrast to the other parent compounds of iron arsenide superconductors.

3 pages, 5 figures

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• Lattice distortion and stripe-like antiferromagnetic order in Ca10(Pt3As8)(Fe2As2)5
• Unfolding the electronic structure of Ca${}_{10}$(Fe${}_{1-x}$Pt${}_x$As)${}_{10}$(Pt${}_n$As${}_8$)
• Optical properties of the optimally doped Ca${}_{8.5}$La${}_{1.5}$(Pt${}_3$As${}_8$)(Fe${}_2$As${}_2$)${}_5$ single crystal
• Unravelling the mechanism of the semiconducting-like behavior and its relation to superconductivity in (CaFe${}_{1-x}$Pt${}_x$As)${}_{10}$Pt${}_3$As${}_8$
• Superconductivity by transition metal doping in Ca${}_{10}$(Fe${}_{1-x}$M${}_x$As)${}_{10}$(Pt${}_3$As${}_8$) (M = Co, Ni, Cu)