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Spin Wave Spectra in Pseudoperovskite Manganites with Superexchange Interaction Competition

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Abstract

In compounds La1/3Ca2/3MnO3 and BiMnO3, a calculation of spin-wave dispersion dependences along pseudoperovskite directions of reciprocal space is made. The model includes orbitally dependent superexchange interaction and single-ion anisotropy. Considered compounds present competing exchange interactions within magnetic unit cell because of orbital or charge-orbital ordering. The nearest neighbor superexchange interaction is taken into account. The magnetic structure and dispersion dependences of spin waves frequencies are calculated within the framework of regular multi-sublattice model. The peculiarities of frustrated magnetic spin-wave spectra are found. It is shown, that crossing and splitting of spin-waves branches in non-symmetric points of magnetic Brillouin zone is a common feature of the spectra due to exchange competition. The band structure of Г-point spectra for both compounds are predicted.

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Authors and Affiliations

  1. Ural State University of Railway Transport, 66, Kolmogorova St., 620034, Yekaterinburg, Russia

    Liudmila E. Gonchar

  2. Ural Federal University, 19, Mira St., 620002, Yekaterinburg, Russia

    Liudmila E. Gonchar

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  1. Liudmila E. Gonchar
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L.E. Gonchar as a single author has made calculation, wrote the manuscript text and prepared all Figures.

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Correspondence to Liudmila E. Gonchar.

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Gonchar, L.E. Spin Wave Spectra in Pseudoperovskite Manganites with Superexchange Interaction Competition. Appl Magn Reson 54, 503–511 (2023). https://doi.org/10.1007/s00723-023-01532-z

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  • DOI: https://doi.org/10.1007/s00723-023-01532-z

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