Single phase charge ordered stoichiometric CaFe₃O₅ with commensurate and incommensurate trimeron ordering.

ABSTRACT: Mixed-valent transition metal compounds display complex structural, electronic and magnetic properties which can often be exquisitely tuned. Here the charge-ordered state of stoichiometric CaFe₃O₅ is probed using neutron powder diffraction, Monte Carlo simulation and symmetry analysis. Magnetic ordering is dominated by the formation of ferromagnetic Fe³⁺-Fe²⁺-Fe³⁺ trimers which are evident above the magnetic ordering transition. Between T_N= 289 K and 281 K an incommensurate magnetically ordered phase develops due to magnetic frustration, but a spin Jahn-Teller distortion lifts the frustration and enables the magnetic ordering to lock in to a charge-ordered commensurate state at lower temperatures. Stoichiometric CaFe_3<

SUBMITTER: Cassidy SJ 

PROVIDER: S-EPMC6889228 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature