Local electronic structure and magnetic properties of LaMn 0.5 Co 0.5 O 3 studied by x-ray absorption and magnetic circular dichroism spectroscopy

• Verfasst von: Burnus, Tobias [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Local electronic structure and magnetic properties of LaMn 0.5 Co 0.5 O 3 studied by x-ray absorption and magnetic circular dichroism spectroscopy
• Verf.angabe: T. Burnus, Z. Hu, H.H. Hsieh, V.L.J. Joly, P.A. Joy, M.W. Haverkort, Hua Wu, A. Tanaka, H.-J. Lin, C.T. Chen, and L.H. Tjeng
• Fussnoten: Die Gruppen "0.5" und die Ziffer "3" im Titel sind tiefgestellt ; Gesehen am 07.11.2017
• Titel Quelle: Enthalten in: Physical review / B
• Jahr Quelle: 2008
• Band/Heft Quelle: 77(2008,12) Artikel-Nummer 125124, 7 Seiten
• ISSN Quelle: 1550-235X
• DOI: doi:10.1103/PhysRevB.77.125124
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565113845

Abstract

We have studied the local electronic structure of LaMn0.5Co0.5O3 using soft-x-ray absorption spectroscopy at the Co−L3,2 and Mn−L3,2 edges. We found a high-spin Co2+−Mn4+ valence state for samples with the optimal Curie temperature. We discovered that samples with lower Curie temperatures contain low-spin nonmagnetic Co3+ ions. Using soft-x-ray magnetic circular dichroism, we established that the Co2+ and Mn4+ ions are ferromagnetically aligned. We also revealed that the Co2+ ions have a large orbital moment: morb/mspin≈0.47. Together with model calculations, this suggests the presence of a large magnetocrystalline anisotropy in the material and predicts a nontrivial temperature dependence for the magnetic susceptibility.