Altermagnetic splitting of magnons in hematite <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>α</mml:mi> <mml:mtext>−</mml:mtext> <mml:msub> <mml:mi>Fe</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:msub> <mml:mi mathvariant="normal">O</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math>
Rhea Hoyer, P. Peter Stavropoulos, Aleksandar Razpopov, Roser Valentí, Libor Šmejkal, Alexander Mook
Abstract
The authors investigate here the influence of spin-orbit coupling corrections on the magnon dispersion relation of the $g$-wave altermagnet candidate hematite ($\ensuremath{\alpha}$-Fe${}_{2}$O${}_{3}$). They show that for both the easy-axis phase below and the weak ferromagnetic phase above the Morin transition temperature, the corrections are concentrated at the Brillouin zone center at low magnon energies, leaving intact the altermagnetic splitting of the magnon modes at higher energies and nonzero crystal momentum. The authors discuss implications for inelastic neutron scattering and magnon transport.
Topics & Concepts
MagnonBrillouin zonePhysicsInelastic neutron scatteringSpin waveCondensed matter physicsDispersion relationNeutronFerromagnetismNeutron scatteringNuclear physicsIron oxide chemistry and applicationsMagnetic Properties and Synthesis of FerritesMultiferroics and related materials