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Metastable antiphase boundary ordering in CaFe$_{2}$O$_{4}$
- Source :
- Phys. Rev. B 104, 104404 (2021)
- Publication Year :
- 2021
-
Abstract
- CaFe$_{2}$O$_{4}$ is an $S=5/2$ antiferromagnet exhibiting two magnetic orders which shows regions of coexistence at some temperatures. Using a Green's function formalism, we model neutron scattering data of the spin wave excitations in this material, ellucidating the microscopic spin Hamiltonian. In doing so, we suggest that the low temperature A phase order $(\uparrow\uparrow\downarrow\downarrow)$ finds its origins in the freezing of antiphase boundaries created by thermal fluctuations in a parent B phase order $(\uparrow\downarrow\uparrow\downarrow)$. The low temperature magnetic order observed in CaFe$_{2}$O$_{4}$ is thus the result of a competition between the exchange coupling along $c$, which favors the B phase, and the single-ion anisotropy which stabilizes thermally-generated antiphase boundaries, leading to static metastable A phase order at low temperatures.<br />Comment: 16 pages, 10 figures
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 104, 104404 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2108.09679
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.104.104404