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

TL;DR

This study investigates the structural and magnetic phase transitions in triclinic Ca10(FeAs)10(Pt3As8), revealing how platinum doping influences these transitions and the nature of magnetic ordering without symmetry breaking.

Contribution

It provides new insights into the phase transitions and magnetic properties of Ca10(FeAs)10(Pt3As8), highlighting differences from other iron arsenide parent compounds.

Findings

Structural transition at ~120 K with lattice splitting

Pt doping shifts transition to 80 K and weakens distortion

Magnetic order onset near structural transition without symmetry breaking

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.