01950nas a2200169   4500008004100000022001400041245006800055210006600123260008300189300001100272490000700283520132800290100002301618700002401641700002501665856009001690       2005                        eng d  a1098-012100aEffect of disorder on the magnetic properties of LaMn0.5Fe0.5O30 aEffect of disorder on the magnetic properties of LaMn05Fe05O3  aONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USAbAMERICAN PHYSICAL SOCcAUG  a0544260 v723 a<p>Polycrystalline LaMn0.5Fe0.5O3 is synthesized by a low-temperature method and the magnetic properties of the resulting powder have been studied after annealing the sample in air at different temperatures in the range 200 degrees C-1350 degrees C. Room temperature Mossbauer spectroscopic studies show that the Fe ions are present in the +3 oxidation state in the material. However, the magnetic properties vary widely in an unexpected manner when samples are annealed at different temperatures. Zero field cooled magnetization studies show a cusp below 100 K, for the sample annealed at 200 degrees C, indicating a spin-glass-like or superparamagnetic behavior. However, this cusp disappears completely when the sample is annealed at 700 degrees C but still showing a magnetic hysteresis loop with reduced magnetization at low temperatures. The cusp again appears when the sample is annealed at higher temperatures with increasing low-temperature magnetization. EPR and IR spectroscopic studies indicate changes in the distribution of Mn3+ and Fe3+ ions in the lattice. The overall results can be explained in terms of random distribution of Mn3+ and Fe3+ ions in the lattice and formation of some magnetic clusters, with the degree of distribution of the ions varying for samples annealed at different temperatures.</p>1 aBhame, Shekhar, D.1 aJoly, V., L. Joseph1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/effect-disorder-magnetic-properties-lamn05fe05o3-101743nas a2200265   4500008004100000022001400041245015200055210006900207260007900276300001100355490000700366520078000373100001501153700001101168700001801179700002401197700002501221700002201246700001201268700001501280700001701295700001701312700001801329856013001347       2008                        eng d  a1098-012100aLocal electronic structure and magnetic properties of LaMn(0.5)Co(0.5)O(3) studied by x-ray absorption and magnetic circular dichroism spectroscopy0 aLocal electronic structure and magnetic properties of LaMn05Co05  aONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USAbAMER PHYSICAL SOCcMAR  a1251240 v773 a<p>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.</p>1 aBurnus, T.1 aHu, Z.1 aHsieh, H., H.1 aJoly, V., L. Joseph1 aJoy, Pattayil, Alias1 aHaverkort, M., W.1 aWu, Hua1 aTanaka, A.1 aLin, H., -J.1 aChen, C., T.1 aTjeng, L., H.  uhttps://library.ncl.res.in/content/local-electronic-structure-and-magnetic-properties-lamn05co05o3-studied-x-ray-absorption-0