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research article

Spin dynamics in the square-lattice cupola system Ba(TiO)Cu-4(PO4)(4)

Testa, Luc  
•
Babkevich, Peter  
•
Kato, Yasuyuki
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June 6, 2022
Physical Review B

We report high-resolution single-crystal inelastic neutron scattering measurements on the spin-1/2 antiferromagnet Ba(TiO)Cu-4(PO4)(4). This material is formed from layers of four-site "cupola" structures, oriented alternately upwards and downwards, which constitute a rather special realization of two-dimensional (2D) square-lattice magnetism. The strong Dzyaloshinskii-Moriya (DM) interaction within each cupola, or plaquette, unit has a geometry largely unexplored among the numerous studies of magnetic properties in 2D Heisenberg models with spin and spatial anisotropies. We have measured the magnetic excitations at zero field and in fields up to 5 T, finding a complex mode structure with multiple characteristic features that allow us to extract all the relevant magnetic interactions by modeling within the linear spin-wave approximation. We demonstrate that Ba(TiO)Cu-4(PO4)(4) is a checkerboard system with almost equal intra-and interplaquette couplings, in which the intraplaquette DM interaction is instrumental both in enforcing robust magnetic order and in opening a large gap at the Brillouin-zone center. We place our observations in the perspective of generalized phase diagrams for spin-1/2 square-lattice models and materials, where exploring anisotropies and frustration as routes to quantum disorder remains a frontier research problem.

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Type
research article
DOI
10.1103/PhysRevB.105.214406
Web of Science ID

WOS:000821437600004

Author(s)
Testa, Luc  
•
Babkevich, Peter  
•
Kato, Yasuyuki
•
Kimura, Kenta
•
Favre, Virgile  
•
Rodriguez-Rivera, Jose A.
•
Ollivier, Jacques
•
Raymond, Stephane
•
Kimura, Tsuyoshi
•
Motome, Yukitoshi
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Date Issued

2022-06-06

Publisher

AMER PHYSICAL SOC

Published in
Physical Review B
Volume

105

Issue

21

Article Number

214406

Subjects

Materials Science, Multidisciplinary

•

Physics, Applied

•

Physics, Condensed Matter

•

Materials Science

•

Physics

•

heisenberg-antiferromagnet

•

zero

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LQM  
Available on Infoscience
July 18, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/189405
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