%0 Journal Article %J Physical Review B %D 2008 %T 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 %A Burnus, T. %A Hu, Z. %A Hsieh, H. H. %A Joly, V. L. Joseph %A Joy, Pattayil Alias %A Haverkort, M. W. %A Wu, Hua %A Tanaka, A. %A Lin, H. -J. %A Chen, C. T. %A Tjeng, L. H. %X

We have studied the local electronic structure of LaMn(0.5)Co(0.5)O(3) using soft-x-ray absorption spectroscopy at the Co-L(3,2) and Mn-L(3,2) edges. We found a high-spin Co(2+)-Mn(4+) valence state for samples with the optimal Curie temperature. We discovered that samples with lower Curie temperatures contain low-spin nonmagnetic Co(3+) ions. Using soft-x-ray magnetic circular dichroism, we established that the Co(2+) and Mn(4+) ions are ferromagnetically aligned. We also revealed that the Co(2+) ions have a large orbital moment: morb/mspin approximate to 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.

%B Physical Review B %I AMER PHYSICAL SOC %C ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA %V 77 %P 125124 %8 MAR %G eng %N 12 %3 Foreign %4 3.772 %R 10.1103/PhysRevB.77.125124