Valence and spin states, and the metal-insulator transition in ferromagnetic La2-x Srx MnNiO6 (x=0,0.2)

Kang, J. -S.; Lee, H. J.; Kim, D. H.; Kolesnik, S.; Dabrowski, B.; Swierczek, K.; Lee, Jieun; Kim, Bongjae; Min, B. I.

doi:10.1103/PhysRevB.80.045115

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Valence and spin states, and the metal-insulator transition in ferromagnetic La2-x Srx MnNiO6 (x=0,0.2) : Valence and spin states, and the metal-insulator transition in ferromagnetic La2-xSrxMnNiO6 (x=0,0.2)

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Authors: Kang, J. -S.; Lee, H. J.; Kim, D. H.; Kolesnik, S.; Dabrowski, B.; Swierczek, K.; Lee, Jieun; Kim, Bongjae; Min, B. I.

Issue Date: 2009-07

Publisher: AMER PHYSICAL SOC

Citation: PHYSICAL REVIEW B, Vol.80 No.4

Abstract: Electronic structures of a ferromagnetic insulator La2MnNiO6 and Sr-doped La1.8Sr0.2MnNiO6 have been investigated by employing soft x-ray synchrotron-radiation spectroscopies, first-principles band-structure calculations, and ligand-field multiplet calculations. Our study provides evidence that La2MnNiO6 has the [high-spin (HS) Mn4+-(3)A(2) Ni2+] configuration while La1.8Sr0.2MnNiO6 has [HS Mn4+-(3)A(2) Ni2+ low-spin Ni3+]. It is directly observed that the spin moments of Mn and Ni ions are coupled ferromagnetically. The metallic spectral weight is observed for x=0.2 in O 1s x-ray absorption spectroscopy, which is consistent with the half-metallic ground state predicted by band-structure calculations.