Valence, spin, and orbital state of the Co ions in the one-dimensional Ca3Co2O6

• Verfasst von: Burnus, Tobias [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Valence, spin, and orbital state of the Co ions in the one-dimensional Ca3Co2O6
• 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 28.11.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Jahr Quelle: 2006
• Band/Heft Quelle: (2006) Artikel-Nummer 0611545, 5 Seiten
• DOI: doi:10.1103/PhysRevB.74.245111
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565755332

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.