Interplay of Spin and Orbital Orderings in Perovskite Manganites

Wataru Koshibae; Yuhki Kawamura; Satoshi Okamoto; Jun Ichiro Inoue; Sadamichi Maekawa; Sumio Ishihara; Sadamichi Maekawa

doi:10.1143/JPSJ.66.957

Interplay of Spin and Orbital Orderings in Perovskite Manganites

Wataru Koshibae, Yuhki Kawamura, Satoshi Okamoto, Jun Ichiro Inoue, Sadamichi Maekawa, Sumio Ishihara, Sadamichi Maekawa

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54 Scopus citations

Abstract

We present an exact diagonalization study for perovskite manganites using an effective Hamiltonian which includes a coupling between the spin and orbital degrees of freedom derived from a strong on-site Coulomb interaction and orbital degeneracy of Mn ions. We investigate spin and orbital orderings as well as their excitations for the undoped insulating and the doped charge-ordered phases using three-dimensional 2×2×2 clusters to maintain proper symmetry of the systems. It is shown that the anisotropic magnetic structures, such as A-type antiferromagnetic ordering, are realized by self-adjustment of the orbital ordering where the orbital degeneracy is lifted by spins, indicating a strong interplay of spins and orbitals.

Original language	English
Pages (from-to)	957-960
Number of pages	4
Journal	Journal of the Physical Society of Japan
Volume	66
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.66.957
State	Published - 1997
Externally published	Yes

Keywords

Mn oxides
exact diagonalization
orbital ordering
strongly correlated electron systems

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10.1143/JPSJ.66.957

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abstract = "We present an exact diagonalization study for perovskite manganites using an effective Hamiltonian which includes a coupling between the spin and orbital degrees of freedom derived from a strong on-site Coulomb interaction and orbital degeneracy of Mn ions. We investigate spin and orbital orderings as well as their excitations for the undoped insulating and the doped charge-ordered phases using three-dimensional 2×2×2 clusters to maintain proper symmetry of the systems. It is shown that the anisotropic magnetic structures, such as A-type antiferromagnetic ordering, are realized by self-adjustment of the orbital ordering where the orbital degeneracy is lifted by spins, indicating a strong interplay of spins and orbitals.",

keywords = "Mn oxides, exact diagonalization, orbital ordering, strongly correlated electron systems",

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T1 - Interplay of Spin and Orbital Orderings in Perovskite Manganites

AU - Koshibae, Wataru

AU - Kawamura, Yuhki

AU - Okamoto, Satoshi

AU - Inoue, Jun Ichiro

AU - Maekawa, Sadamichi

AU - Ishihara, Sumio

AU - Maekawa, Sadamichi

PY - 1997

Y1 - 1997

N2 - We present an exact diagonalization study for perovskite manganites using an effective Hamiltonian which includes a coupling between the spin and orbital degrees of freedom derived from a strong on-site Coulomb interaction and orbital degeneracy of Mn ions. We investigate spin and orbital orderings as well as their excitations for the undoped insulating and the doped charge-ordered phases using three-dimensional 2×2×2 clusters to maintain proper symmetry of the systems. It is shown that the anisotropic magnetic structures, such as A-type antiferromagnetic ordering, are realized by self-adjustment of the orbital ordering where the orbital degeneracy is lifted by spins, indicating a strong interplay of spins and orbitals.

AB - We present an exact diagonalization study for perovskite manganites using an effective Hamiltonian which includes a coupling between the spin and orbital degrees of freedom derived from a strong on-site Coulomb interaction and orbital degeneracy of Mn ions. We investigate spin and orbital orderings as well as their excitations for the undoped insulating and the doped charge-ordered phases using three-dimensional 2×2×2 clusters to maintain proper symmetry of the systems. It is shown that the anisotropic magnetic structures, such as A-type antiferromagnetic ordering, are realized by self-adjustment of the orbital ordering where the orbital degeneracy is lifted by spins, indicating a strong interplay of spins and orbitals.

KW - Mn oxides

KW - exact diagonalization

KW - orbital ordering

KW - strongly correlated electron systems

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DO - 10.1143/JPSJ.66.957

M3 - Article

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SP - 957

EP - 960

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - 4

ER -

Interplay of Spin and Orbital Orderings in Perovskite Manganites

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Keywords

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