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Orbital Ordering (orbital + ordering)
Selected AbstractsChemInform Abstract: Density Functional Theory Studies of Spin, Charge, and Orbital Ordering in YBaT2O5 (T: Mn, Fe, Co).CHEMINFORM, Issue 40 2008R. Vidya Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Spin, Charge, and Orbital Ordering in the B-Site Diluted Manganates La2-xSrxGaMnO6.CHEMINFORM, Issue 14 2002P. D. Battle Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Reply to "Comment on ,Orbital ordering and orbital fluctuations in transition metal oxides'" [phys. stat. sol. (b) 242, No. 4, 962 (2005)]PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 4 2005Andrzej M. Ole Abstract We point out that the high degeneracy of 3T1g ground state of V3+ ions in LaVO3, used to derive the spin-orbital model analyzed in the previous paper [A. M. Ole,, phys. stat. sol. (b) 236, 281 (2003)], allows for the orbital fluctuations which stabilize the ferromagnetic bonds in the C -type antiferromagnetic phase of cubic vanadates. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Orbital ordering and orbital fluctuations in transition metal oxides [phys. stat. sol. (b) 236, No. 2, 281,288 (2003)]PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 11 2004Andrzej M. Ole Abstract The labeling of Fig. 1(b) has to be corrected. See original phys. stat. sol. (b) 236, No. 2, 281,288 (2003) [source] The changes of magnetic properties of the perovskite-type titanium oxides by the structural distortions: In the case of LaTiO3 and YTiO3INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, Issue 15 2007Taku Onishi Abstract In the perovskite-type titanium oxides, the changes of magnetic properties by GdFeO3 -type lattice distortion are observed. In this study, we have performed cluster model calculations based on the density functional theory method, and have obtained the effective exchange integral (Jab) in order to elucidate the magnetic change by the GdFeO3 -type lattice distortion. The components of deciding the orbital ordering and magnetic property have also been discussed. © 2007 Wiley Periodicals, Inc. Int J Quantum Chem, 2007 [source] Raman phonons and Raman Jahn,Teller bands in perovskite-like manganitesJOURNAL OF RAMAN SPECTROSCOPY, Issue 10 2001Milko N. Iliev The perovskite-like manganites R1,xAxMnO3, where R is a trivalent rare earth or Y and A is a divalent alkaline earth element, are characterized by a strong interplay of magnetism, electric transport and crystallographic distortion. At doping levels 0.15 < x < 0.45 the materials exhibit colossal magnetoresistance near the concomitant ferromagnetic and insulator,metal transitions. At a fractional doping level, such as x = 0.5, the crystallographic and magnetic environment is strongly modified and charge ordering between Mn3+ and Mn4+ or phase separation takes place. In this work, the polarized Raman spectra of the orthorhombic and rhombohedral phases of parent RMnO3 compound were analyzed in close comparison with results of lattice dynamic calculations. We argue that the strong high-wavenumber bands between 400 and 700 cm,1, which dominate the Raman spectra of rhombohedral RMnO3 and magnetoresistive La1,xAxMnO3 are not proper Raman modes for the R3c or Pnma structures. Rather, the bands are of phonon density-of-states origin and correspond to oxygen phonon branches activated by the non-coherent Jahn,Teller distortions of the Mn3+O6 octahedra. The reduction of these bands upon doping of La1,xAxMnO3 and their disappearance in the ferromagnetic metallic phase support the model. The variation with temperature of the Raman spectra of La0.5Ca0.5MnO3 is also discussed. The results give a strong indication for charge and orbital ordering and formation of superstructure at low temperatures. Copyright © 2001 John Wiley & Sons, Ltd. [source] Resonant X-ray scattering in the presence of several anisotropic factorsACTA CRYSTALLOGRAPHICA SECTION A, Issue 1 2000E. N. Ovchinnikova The general form of the X-ray susceptibility tensor near absorption edges is found when several anisotropic factors, such as the anisotropy of local atomic environment, magnetic ordering and orbital ordering, simultaneously exist in a crystal. Different phenomenological approaches are used to obtain the explicit form of the susceptibility tensor and to find the contributions from each anisotropic factor separately as well as `combined' terms owing to their simultaneous existence. The results of the theoretical treatment are applied to the resonant diffraction by La0.5Sr1.5MnO4 below the Néel temperature, where charge and orbital ordering coexist with anisotropy of local atomic environment and magnetic ordering. [source] | ||||||||||