Spin state transition in LaCoO 3 studied using soft x-ray absorption spectroscopy and magnetic circular dichroism

• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Spin state transition in LaCoO 3 studied using soft x-ray absorption spectroscopy and magnetic circular dichroism
• Verf.angabe: M.W. Haverkort, Z. Hu, J.C. Cezar, T. Burnus, H. Hartmann, M. Reuther, C. Zobel, T. Lorenz, A. Tanaka, N.B. Brookes, H.H. Hsieh, H.-J. Lin, C.T. Chen, and L.H. Tjeng
• Fussnoten: Im Titel ist "3" tiefgestellt ; Gesehen am 08.11.2017
• Titel Quelle: Enthalten in: Physical review letters
• Jahr Quelle: 2006
• Band/Heft Quelle: 97(2006,17) Artikel-Nummer 176405, 4 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.97.176405
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565125312

Abstract

Using soft x-ray absorption spectroscopy and magnetic circular dichroism at the Co-L2,3 edge, we reveal that the spin state transition in LaCoO3 can be well described by a low-spin ground state and a triply degenerate high-spin first excited state. From the temperature dependence of the spectral line shapes, we find that LaCoO3 at finite temperatures is an inhomogeneous mixed-spin state system. It is crucial that the magnetic circular dichroism signal in the paramagnetic state carries a large orbital momentum. This directly shows that the currently accepted low- or intermediate-spin picture is at variance. Parameters derived from these spectroscopies fully explain existing magnetic susceptibility, electron spin resonance, and inelastic neutron data.