Intricacies of the Co${}^{3+}$ spin state in Sr${}_2$Co${}_{0.5}$Ir${}_{0.5}$O${}_4$: an x-ray absorption and magnetic circular dichroism study

Abstract

We report on a combined soft x-ray absorption and magnetic circular dichroism (XMCD) study at the Co-$L_{3,2}$ on the hybrid 3$d$/5$d$ solid state oxide Sr${}_2$Co${}_{0.5}$Ir${}_{0.5}$O${}_4$ with the K${}_2$NiF${}_4$ structure. Our data indicate unambiguously a pure high spin state $(S=2)$ for the Co${}^{3+}$ (3$d^6$) ions with a significant unquenched orbital moment $L_z/2S_z=0.25$ despite the sizeable elongation of the CoO${}_6$ octahedra. Using quantitative model calculations based on parameters consistent with our spectra, we have investigated the stability of this high spin state with respect to the competing low spin and intermediate spin states.

7 pages, 4 figures

References in corpus (7)

• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• The spin state transition in LaCoO${}_3$; revising a revision
• A different look at the spin state of Co${}^{3+}$ ions in CoO${}_5$ pyramidal coordination
• Valence, spin, and orbital state of the Co ions in the one-dimensional Ca3Co2O6: an x-ray absorption and magnetic circular dichroism study
• Spin blockade, orbital occupation and charge ordering in La_(1.5)Sr_(0.5)CoO4
• Electronic and magnetic properties of the kagome systems YBaCo4O7 and YBaCo3MO7 (M=Al, Fe)
• Spin and charge orders and their hole-doping dependence in single layered cobaltate La2-xCaxCoO4(0.3<x<0.8)

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