Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T55: Correlated Electron Materials I
11:30 AM–2:30 PM,
Thursday, March 9, 2023
Room: Room 305
Sponsoring
Unit:
GMAG
Chair: Adam Aczel, Oak Ridge Nat'l Lab
Abstract: T55.00010 : Magnonic dispersion of Er2O3*
1:18 PM–1:30 PM
Presenter:
Mehdi Maleki Sanukesh
(University of Iowa)
Authors:
Mehdi Maleki Sanukesh
(University of Iowa)
Michael E Flatté
(University of Iowa)
We consider zero temperature Er2O3 in an antiferromagnetic state that hosts magnons and approximate the interaction of the spins as exchange interaction and magnetic dipole-dipole interaction. The symmetry axes of the spins are considered in the exchange interaction and the external magnetic field. This model is valid when the external magnetic field is below 1.5 Tesla at which the spin-flop occurs. Similar models will describe other dipole-dipole interactions of spins, such as ensembles of molecular spins. The Holstein-Primakoff representation and paraunitary diagonalization are employed to quantize the Hamiltonian. Er2O3 has 32 erbium atoms in a non-primitive cubic unit cell. The long-range nature of magnetic dipole-dipole interaction poses a challenging issue for considering magnonic structure from dipole-dipole interactions. The dipole-dipole interaction drops as a cube power of the separation between spins. If these long-distance neighbors are ignored the magnonic dispersion will change.
*This work was supported as part of the Center for Molecular Quantum Transduction, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award Number DE-SC0021314.
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