Spin and orbital orderings and their excitations in perovskite Mn oxides

J. Inoue; S. Ishihara; W. Koshibae; Y. Kawamura; S. Okamoto; S. Maekawa

doi:10.1007/BF02548134

Spin and orbital orderings and their excitations in perovskite Mn oxides

J. Inoue, S. Ishihara, W. Koshibae, Y. Kawamura, S. Okamoto, S. Maekawa

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Abstract

An effective Hamiltonian, which includes a coupling between spins and orbitals, is derived for manganites by taking into account the Hund coupling, on-site Coulomb interaction and orbital degeneracy of the e_g state. By using the effective Hamiltonian, magnetic structures, spin and orbital excitations are studied in a mean field approximation for the undoped insulating phase and in the exact diagonalization method for the undoped and 50 % doped charge-ordered phases. It is shown that the coupling between spins and orbitals is crucial to the magnetic structures and that the so-called A-type AF is realized by self-adjusting the orbital ordering. Implication to the colossal magnetoresistance in manganites is given.

Original language	English
Pages (from-to)	3225-3231
Number of pages	7
Journal	Czechoslovak Journal of Physics
Volume	46
Issue number	SUPPL. 6
DOIs	https://doi.org/10.1007/BF02548134
State	Published - 1996
Externally published	Yes

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title = "Spin and orbital orderings and their excitations in perovskite Mn oxides",

abstract = "An effective Hamiltonian, which includes a coupling between spins and orbitals, is derived for manganites by taking into account the Hund coupling, on-site Coulomb interaction and orbital degeneracy of the eg state. By using the effective Hamiltonian, magnetic structures, spin and orbital excitations are studied in a mean field approximation for the undoped insulating phase and in the exact diagonalization method for the undoped and 50 % doped charge-ordered phases. It is shown that the coupling between spins and orbitals is crucial to the magnetic structures and that the so-called A-type AF is realized by self-adjusting the orbital ordering. Implication to the colossal magnetoresistance in manganites is given.",

author = "J. Inoue and S. Ishihara and W. Koshibae and Y. Kawamura and S. Okamoto and S. Maekawa",

year = "1996",

doi = "10.1007/BF02548134",

language = "English",

volume = "46",

pages = "3225--3231",

journal = "Czechoslovak Journal of Physics",

issn = "0011-4626",

number = "SUPPL. 6",

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TY - JOUR

T1 - Spin and orbital orderings and their excitations in perovskite Mn oxides

AU - Inoue, J.

AU - Ishihara, S.

AU - Koshibae, W.

AU - Kawamura, Y.

AU - Okamoto, S.

AU - Maekawa, S.

PY - 1996

Y1 - 1996

N2 - An effective Hamiltonian, which includes a coupling between spins and orbitals, is derived for manganites by taking into account the Hund coupling, on-site Coulomb interaction and orbital degeneracy of the eg state. By using the effective Hamiltonian, magnetic structures, spin and orbital excitations are studied in a mean field approximation for the undoped insulating phase and in the exact diagonalization method for the undoped and 50 % doped charge-ordered phases. It is shown that the coupling between spins and orbitals is crucial to the magnetic structures and that the so-called A-type AF is realized by self-adjusting the orbital ordering. Implication to the colossal magnetoresistance in manganites is given.

AB - An effective Hamiltonian, which includes a coupling between spins and orbitals, is derived for manganites by taking into account the Hund coupling, on-site Coulomb interaction and orbital degeneracy of the eg state. By using the effective Hamiltonian, magnetic structures, spin and orbital excitations are studied in a mean field approximation for the undoped insulating phase and in the exact diagonalization method for the undoped and 50 % doped charge-ordered phases. It is shown that the coupling between spins and orbitals is crucial to the magnetic structures and that the so-called A-type AF is realized by self-adjusting the orbital ordering. Implication to the colossal magnetoresistance in manganites is given.

UR - http://www.scopus.com/inward/record.url?scp=77957802294&partnerID=8YFLogxK

U2 - 10.1007/BF02548134

DO - 10.1007/BF02548134

M3 - Article

AN - SCOPUS:77957802294

SN - 0011-4626

VL - 46

SP - 3225

EP - 3231

JO - Czechoslovak Journal of Physics

JF - Czechoslovak Journal of Physics

IS - SUPPL. 6

ER -

Spin and orbital orderings and their excitations in perovskite Mn oxides

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