Spin-wave dispersion softening in the ferromagnetic Kondo lattice model for manganites

F. Mancini; N. B. Perkins; N. M. Plakida

doi:10.1016/S0375-9601(01)00321-8

Spin-wave dispersion softening in the ferromagnetic Kondo lattice model for manganites

F. Mancini
, N. B. Perkins
, N. M. Plakida

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Spin dynamics is calculated in the ferromagnetic (FM) state of the generalized Kondo lattice model taking into account strong on-site correlations between e_g electrons and antiferromagnetic (AFM) exchange among t_2g spins. Our study suggests that competing FM double-exchange and AFM super-exchange interaction lead to a rather nontrivial spin-wave spectrum. While spin excitations have a conventional Dq² spectrum in the long-wavelength limit, there is a strong deviation from the spin-wave spectrum of the isotropic Heisenberg model close to the zone boundary. The relevance of our results to the experimental data are discussed.

Original language	English (US)
Pages (from-to)	286-293
Number of pages	8
Journal	Physics Letters, Section A: General, Atomic and Solid State Physics
Volume	284
Issue number	6
DOIs	https://doi.org/10.1016/S0375-9601(01)00321-8
State	Published - 2001
Externally published	Yes

Bibliographical note

Funding Information:
We thank G. Khaliullin and G. Jackeli for valuable discussions. N.B.P. wishes to acknowledge partial support by Unità INFM di Salerno. Financial support by INTAS Program, Grants No. 97-90963 and No. 97-11066, are acknowledged by N.B.P. and N.M.P.

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10.1016/S0375-9601(01)00321-8

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title = "Spin-wave dispersion softening in the ferromagnetic Kondo lattice model for manganites",

abstract = "Spin dynamics is calculated in the ferromagnetic (FM) state of the generalized Kondo lattice model taking into account strong on-site correlations between eg electrons and antiferromagnetic (AFM) exchange among t2g spins. Our study suggests that competing FM double-exchange and AFM super-exchange interaction lead to a rather nontrivial spin-wave spectrum. While spin excitations have a conventional Dq2 spectrum in the long-wavelength limit, there is a strong deviation from the spin-wave spectrum of the isotropic Heisenberg model close to the zone boundary. The relevance of our results to the experimental data are discussed.",

author = "F. Mancini and Perkins, \{N. B.\} and Plakida, \{N. M.\}",

note = "Funding Information: We thank G. Khaliullin and G. Jackeli for valuable discussions. N.B.P. wishes to acknowledge partial support by Unit{\`a} INFM di Salerno. Financial support by INTAS Program, Grants No. 97-90963 and No. 97-11066, are acknowledged by N.B.P. and N.M.P.",

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doi = "10.1016/S0375-9601(01)00321-8",

language = "English (US)",

volume = "284",

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TY - JOUR

T1 - Spin-wave dispersion softening in the ferromagnetic Kondo lattice model for manganites

AU - Mancini, F.

AU - Perkins, N. B.

AU - Plakida, N. M.

N1 - Funding Information: We thank G. Khaliullin and G. Jackeli for valuable discussions. N.B.P. wishes to acknowledge partial support by Unità INFM di Salerno. Financial support by INTAS Program, Grants No. 97-90963 and No. 97-11066, are acknowledged by N.B.P. and N.M.P.

PY - 2001

Y1 - 2001

N2 - Spin dynamics is calculated in the ferromagnetic (FM) state of the generalized Kondo lattice model taking into account strong on-site correlations between eg electrons and antiferromagnetic (AFM) exchange among t2g spins. Our study suggests that competing FM double-exchange and AFM super-exchange interaction lead to a rather nontrivial spin-wave spectrum. While spin excitations have a conventional Dq2 spectrum in the long-wavelength limit, there is a strong deviation from the spin-wave spectrum of the isotropic Heisenberg model close to the zone boundary. The relevance of our results to the experimental data are discussed.

AB - Spin dynamics is calculated in the ferromagnetic (FM) state of the generalized Kondo lattice model taking into account strong on-site correlations between eg electrons and antiferromagnetic (AFM) exchange among t2g spins. Our study suggests that competing FM double-exchange and AFM super-exchange interaction lead to a rather nontrivial spin-wave spectrum. While spin excitations have a conventional Dq2 spectrum in the long-wavelength limit, there is a strong deviation from the spin-wave spectrum of the isotropic Heisenberg model close to the zone boundary. The relevance of our results to the experimental data are discussed.

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U2 - 10.1016/S0375-9601(01)00321-8

DO - 10.1016/S0375-9601(01)00321-8

M3 - Article

AN - SCOPUS:0006410723

SN - 0375-9601

VL - 284

SP - 286

EP - 293

JO - Physics Letters, Section A: General, Atomic and Solid State Physics

JF - Physics Letters, Section A: General, Atomic and Solid State Physics

IS - 6

ER -

Spin-wave dispersion softening in the ferromagnetic Kondo lattice model for manganites

Abstract

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