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Structure and magnetism of the Rh 4+ -containing perovskite oxides La0.5Sr0.5Mn0.5Rh0.5O3 and La0.5Sr0.5Fe0.5Rh0.5O3

DOI: 10.1039/D0DT02466J DOI Help

Authors: Nijat Hasanli (University of Oxford) , Alex Scrimshire (Sheffield Hallam University) , Paul A. Bingham (Sheffield Hallam University) , Robert Palgrave (University College London) , Michael Hayward (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Dalton Transactions , VOL 10

State: Published (Approved)
Published: August 2020
Diamond Proposal Number(s): 13284

Open Access Open Access

Abstract: Synchrotron X-ray powder diffraction data indicate that La0.5Sr0.5Mn0.5Rh0.5O3 and La0.5Sr0.5Fe0.5Rh0.5O3 adopt distorted perovskite structures (space group Pnma) with A-site and B-site cation disorder. A combination of XPS and 57Fe Mössbauer data indicate the transition metal cations in the two phases adopt Mn3+/Rh4+ and Fe3+/Rh4+ oxidation state combinations respectively. Transport data indicate both phases are insulating, with ρ vs. T dependences consistent with 3D variable-range hopping. Magnetisation data reveal that La0.5Sr0.5Mn0.5Rh0.5O3 adopts a ferromagnetic state below Tc ∼ 60 K, which is rationalized on the basis of coupling via a dynamic Jahn–Teller distortion mechanism. In contrast, magnetic data reveal La0.5Sr0.5Fe0.5Rh0.5O3 undergoes a transition to a spin-glass state at T ∼ 45 K, attributed to frustration between nearest-neighbour Fe–Rh and next-nearest-neighbour Fe–Fe couplings.

Subject Areas: Chemistry, Materials

Instruments: I11-High Resolution Powder Diffraction