TY - JOUR T1 - 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 JF - Physical Review B Y1 - 2008 A1 - Burnus, T. A1 - Hu, Z. A1 - Hsieh, H. H. A1 - Joly, V. L. Joseph A1 - Joy, Pattayil Alias A1 - Haverkort, M. W. A1 - Wu, Hua A1 - Tanaka, A. A1 - Lin, H. -J. A1 - Chen, C. T. A1 - Tjeng, L. H. AB -

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.

PB - AMER PHYSICAL SOC CY - ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA VL - 77 IS - 12 U3 - Foreign U4 - 3.772 ER -