Spin reorientation and interplanar interactions of the two-dimensional triangular-lattice Heisenberg antiferromagnets h-(Lu, Y)MnO3 and h-(Lu,Sc)FeO3

Document Type

Article

Publication Date

10-1-2024

Abstract

This study explored the magnetic properties and dynamics of two, two-dimensional (2D) triangular-lattice Heisenberg antiferromagnets (2D-TLHAF), h-(Lu,Y)MnO3 and h-(Lu,Sc)FeO3, through neutron powder diffraction, single-crystal neutron scattering, and polarized neutron-scattering experiments. We identified that the magnetic structures of both materials are described by two irreducible representations Γ1 (P63cm) and Γ2 (P63c′m′) for h-Lu0.47Sc0.53FeO3, Γ3 (P63′cm′), and Γ4 (P63′c′m) for h-Lu0.3Y0.7MnO3. Polarized neutron scattering has shown that accurately describing the magnetic structures of a 2D triangular-lattice Heisenberg antiferromagnet (2D-TLHAF) requires the use of two irreducible representations, rather than relying on the assumption that the system undergoes spin reorientation when using only one irreducible representation. We then investigated the spin-wave dispersion of both materials on the basis of these magnetic structures. The branch in the lowest energy of the spin wave of h-Lu0.47Sc0.53FeO3 showed a flat dispersion along the c axis, while Lu0.3Y0.7MnO3 displayed a distinct dispersion along the c axis, suggesting the presence of interplanar interactions in the latter. We discuss the potential causes of spin reorientation and multiferroicity in the triangular antiferromagnetic on the basis of the parameters determined.

Identifier

85210900955 (Scopus)

Publication Title

Physical Review B

External Full Text Location

https://doi.org/10.1103/PhysRevB.110.134444

e-ISSN

24699969

ISSN

24699950

Issue

13

Volume

110

Grant

2022B0192

Fund Ref

Health Research Council of New Zealand

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