Valence, spin, and orbital state of the Co ions in the one-dimensional Ca3Co2O6: an x-ray absorption and magnetic circular dichroism study

Abstract

We have investigated the valence, spin, and orbital state of the Co ions in the one-dimensional cobaltate Ca3Co2O6 using x-ray absorption and x-ray magnetic circular dichroism at the Co-L2,3 edges. The Co ions at both the octahedral Co_oct and trigonal Co_trig sites are found to be in a 3+ state. From the analysis of the dichroism we established a low-spin state for the Co_oct and a high-spin state with an anomalously large orbital moment of 1.7 muB at the Co3+ trig ions. This large orbital moment along the c-axis chain and the unusually large magnetocrystalline anisotropy can be traced back to the double occupancy of the d2 orbital in trigonal crystal field.

5 pages, 4 figures

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Cited by in corpus (28)

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• X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6
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• Formation of Magnetic Microphases in Ca${}_3$Co${}_2$O${}_6$
• Spectroscopic evidence for giant orbital moment and magnetic anisotropy induced by local distortions in alpha-CoV2O6
• Coupled valence and spin state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3
• Spin correlations in Ca3Co2O6: A polarised-neutron diffraction and Monte Carlo study
• Magnetic order, metamagnetic transitions, and low-temperature spin freezing in Ca3Co2O6: an NMR study
• Field-driven magnetisation steps in Ca3Co2O6: A single-crystal neutron-diffraction study
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• Magnetic behavior of nano crystals of a spin-chain system, Ca3Co2O6: Absence of multiple steps in the low temperature isothermal magnetization
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• One-Dimensional Dispersive Magnon Excitation in the Frustrated Spin-2 Chain System Ca3Co2O6
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• Spin State Disproportionation in Insulating Ferromagnetic LaCoO3 Epitaxial Thin Films
• 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
• Resonant X-ray scattering investigation of the multipolar ordering in Ca3Co2O6
• Negative charge transfer energy in correlated compounds
• Modifications in the frustrated magnetism, oxidation state of Co and magnetoelectric coupling effects induced by a partial replacement of Ca by Gd in the spin chain compound Ca3Co2O6
• Effect of a small disruption of the Ca site on the geometrically frustrated magnetic behavior of Ca3CoRhO6
• Three-dimensional ferrimagnetic ground state of triangular-lattice system Ca3Co2O6
• Trigonal distortion in the Kitaev candidate honeycomb magnet BaCo2(AsO4)2