Babkevich, Peter

Favre, Virgile

Kato, Yasuyuki

Kimura, Kenta

Kimura, Tsuyoshi

Motome, Yukitoshi

Normand, Bruce

Ollivier, Jacques

Raymond, Stéphane

Rodriguez-Rivera, Jose

Rønnow, Henrik

Testa, Luc

arXiv

Hal - Université Grenoble Alpes

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

HAL-CEA

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

Rodriguez-Rivera, Jose A.

Raymond, Stephane

Ronnow, Henrik M.

Infoscience - École polytechnique fédérale de Lausanne

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

Hal-Diderot

We report high-resolution single-crystal inelastic neutron scattering
measurements on the spin-1/2 antiferromagnet Ba(TiO)Cu$_4$(PO$_4$)$_4$. 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 modelling within
the linear spin-wave approximation. We demonstrate that
Ba(TiO)Cu$_4$(PO$_4$)$_4$ is a checkerboard system with almost equal intra- and
inter-plaquette couplings, in which the intra-plaquette 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.Comment: 13 pages, 8 figure

Rønnow, Henrik M.

arXiv.org e-Print Archive

Spin dynamics in the square-lattice cupola system
  Ba(TiO)Cu$_4$(PO$_4$)$_4$

HAL Descartes

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

Abstract

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