Abstract
The magnetic and orbital structures in manganese oxides with perovskite structure are examined by using the exact diagonalization method on finite-size clusters. The orbital degeneracy in the eg states is taken into account based on the effective Hamiltonian derived in the insulating state with strong Coulomb interaction. It is shown that A-, C- and G-type antiferromagnetic orderings occur as a result of competition or cooperation of the superexchange interaction of t2g spins and the coupling between spins and orbitals. The spin and orbital excitations are also examined.
Original language | English |
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Pages (from-to) | 1058-1060 |
Number of pages | 3 |
Journal | Physica B: Physics of Condensed Matter |
Volume | 230-232 |
DOIs | |
State | Published - Feb 1997 |
Externally published | Yes |
Funding
The authorsw ouldlike to thankD r. K. Tsutsui for valuabled iscussionT.h is work was supported by a Grant-in-Aidfo r ScientificR esearcohn Priority Areasf romthe Ministryo f EducationS, cience, and Culture of Japan, and the New Energya nd IndustriaTl echnologyD evelopmenOtr ganization (NEDO). Computationws erec arriedo ut in the ComputerC enterof the Institutef or Molecular ScienceO, kazakiN ationalR esearchIn stitutest,h e SupercomputinCge ntero f Institutefo r Materials ResearchT, ohokuU niversitya, nd the Computer Centero f the Institutefo r Solid StateP hysicsU, ni-versityo f Tokyo.
Keywords
- Exact diagonalization
- LaMnO
- Spin and orbital wave