Valence, spin, and orbital state of Co ions in one-dimensional Ca 3Co 2O 6

• Verfasst von: Burnus, Tobias [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Valence, spin, and orbital state of Co ions in one-dimensional Ca 3Co 2O 6
• Titelzusatz: an x-ray absorption and magnetic circular dichroism study
• Verf.angabe: T. Burnus, Z. Hu, M.W. Haverkort, J.C. Cezar, D. Flahaut, V. Hardy, A. Maignan, N.B. Brookes, A. Tanaka, H.H. Hsieh, H.-J. Lin, C.T. Chen, and L.H. Tjeng
• Fussnoten: Im Titel sind "3", "2" und "6" tiefgestellt ; Gesehen am 08.11.2017
• Titel Quelle: Enthalten in: Physical review / B
• Jahr Quelle: 2006
• Band/Heft Quelle: 74(2006,24) Artikel-Nummer 245111, 5 Seiten
• ISSN Quelle: 1550-235X
• DOI: doi:10.1103/PhysRevB.74.245111
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565132092

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 Cooct and trigonal Cotrig sites are found to be in a 3+ state. From the analysis of the dichroism we established a low-spin state for the Cooct and a high-spin state with an anomalously large orbital moment of 1.7μB 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.