Metastable antiphase boundary ordering in $\mathrm{Ca}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$

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Metastable antiphase boundary ordering in $Ca {Fe}_{2} O_{4}$

H. Lane, E. E. Rodriguez, H. C. Walker, Ch. Niedermayer, U. Stuhr, R. I. Bewley, D. J. Voneshen, M. A. Green, J. A. Rodriguez-Rivera, P. Fouquet, S.-W. Cheong, J. P. Attfield, R. A. Ewings, and C. Stock

Phys. Rev. B 104, 104404 – Published 2 September 2021

Abstract

$Ca {Fe}_{2} O_{4}$ is an $S = 5 / 2$ antiferromagnet exhibiting two magnetic orders that 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, elucidating the microscopic spin Hamiltonian. In doing so, we suggest that the low-temperature A phase order $(↑ ↑ ↓ ↓)$ finds its origins in the freezing of antiphase boundaries created by thermal fluctuations in a parent B phase order $(↑ ↓ ↑ ↓)$ . The low-temperature magnetic order observed in $Ca {Fe}_{2} O_{4}$ 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.

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Received 4 June 2021
Revised 5 August 2021
Accepted 6 August 2021

DOI:https://doi.org/10.1103/PhysRevB.104.104404

Physics Subject Headings (PhySH)

Magnetic anisotropy Spin dynamics

Antiferromagnets

Inelastic neutron scattering

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

H. Lane^1,2,3, E. E. Rodriguez⁴, H. C. Walker ³, Ch. Niedermayer ⁵, U. Stuhr⁵, R. I. Bewley³, D. J. Voneshen³, M. A. Green⁶, J. A. Rodriguez-Rivera ^7,8, P. Fouquet ⁹, S.-W. Cheong¹⁰, J. P. Attfield², R. A. Ewings³, and C. Stock¹

¹School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
²School of Chemistry and Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3FJ, United Kingdom
³ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxon OX11 0QX, United Kingdom
⁴Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
⁵Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
⁶School of Physical Sciences, University of Kent, Canterbury CT2 7NH, United Kingdom
⁷NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
⁸Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
⁹Institute Laue-Langevin, 6 rue Jules Horowitz, Boite Postale 156, 38042 Grenoble Cedex 9, France
¹⁰Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

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Vol. 104, Iss. 10 — 1 September 2021

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Physical Review B

covering condensed matter and materials physics

Metastable antiphase boundary ordering in $Ca {Fe}_{2} O_{4}$

H. Lane, E. E. Rodriguez, H. C. Walker, Ch. Niedermayer, U. Stuhr, R. I. Bewley, D. J. Voneshen, M. A. Green, J. A. Rodriguez-Rivera, P. Fouquet, S.-W. Cheong, J. P. Attfield, R. A. Ewings, and C. Stock

Phys. Rev. B 104, 104404 – Published 2 September 2021

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Physical Review B

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Metastable antiphase boundary ordering in CaFe2O4

H. Lane, E. E. Rodriguez, H. C. Walker, Ch. Niedermayer, U. Stuhr, R. I. Bewley, D. J. Voneshen, M. A. Green, J. A. Rodriguez-Rivera, P. Fouquet, S.-W. Cheong, J. P. Attfield, R. A. Ewings, and C. Stock

Phys. Rev. B 104, 104404 – Published 2 September 2021

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Metastable antiphase boundary ordering in $Ca {Fe}_{2} O_{4}$