Journal of the Physical Society of Japan · 1997 · 16 citations · 6 references
Natural SciencesChemistryMaterials ScienceInorganic ChemistryMagnetic MaterialsQuantum ChemistryAntiferromagnetismMagnetic OxidesMagnetic Properties Of SolidsMagnetism In SolidsMagnetism Of Inorganic CompoundsMagnetization ProcessesCoulomb InteractionDegeneracyEffective Hamiltonian TheoryExact DiagonalizationHamiltonian FormulationMagnetic Field DependenceMagnetization DynamicsManganites
In manganites, the spin ordering depends on the orbitals in the e g state of Mn ions. It is shown that the magnetization process is also strongly affected by the orbitals, by using the exact diagonalization technique applied to the effective Hamiltonian which includes a coupling between the spin and orbital degrees of freedom derived from strong on-site Coulomb interaction and orbital degeneracy of Mn ions. We find that the spin moment induced by an applied magnetic field is accompanied with the change of the orbital structure. Such a coupling between the spin and orbital degrees of freedom results in a charasteristic magnetization process of manganites. Recent experimental data obtained in Pr 0.5 Ca 0.5 MnO 3 and related compounds are examined in the light of the present theory.
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Neutron diffraction study of Pr1 − xCaxMnO3 perovskites
Z. Jirák, S. Krupička, Z. Šimša et al. · Journal of Magnetism and Magnetic Materials · 1985 · 836 citations