title: 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), which is the parent compound of the 1038-type iron-arsenide superconductors. High-resolution x-ray diffraction reveals splitting of the in-plane (a,b) lattice parameters at T(s) ≈ 120 K. Platinum-doping weakens the distortion and shifts the transition temperature to 80 K in Ca10(Fe(1-x)Pt(x)As)10(Pt3As8) with x = 0.03. μSR experiments show the onset of magnetic order near T and a broad magnetic phase transition. The structural transition involves no reduction of the space group symmetry in contrast to the other parent compounds of iron-arsenide superconductors; nevertheless the local fourfold symmetry of the FeAs-layers in Ca10(FeAs)10(Pt3As8) is broken.
authors: Department Chemie der Ludwig-Maximilians-Universität München, München, Germany.
authors: T
authors: T
authors: Stürzer
authors: G M
authors: GM
authors: Friederichs
authors: H
authors: H
authors: Luetkens
authors: A
authors: A
authors: Amato
authors: H-H
authors: HH
authors: Klauss
authors: Dirk
authors: D
authors: Johrendt