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$Wannier states and spin supersolid physics in the triangular antiferromagnet K\$_2\$Co(SeO\$_3\$)\$_2\$$

Wannier states and spin supersolid physics in the triangular antiferromagnet K\$_2\$Co(SeO\$_3\$)\$_2\$

by Chinellato, Leandro M , Balz, Christian , Zhu, M , Romerio, V , Zheludev, A , Yan, Z , Kato, Yasuyuki , Murai, N , Ohira-Kawamura, S , Gvasaliya, S , Batista, C D

in Antiferromagnetism / Excitation / Inelastic scattering / Ising model / Lattice vibration / Low temperature / Magnons / Monte Carlo simulation / Neutron scattering

2025

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Wannier states and spin supersolid physics in the triangular antiferromagnet K\$_2\$Co(SeO\$_3\$)\$_2\$

by Chinellato, Leandro M , Balz, Christian , Zhu, M , Romerio, V , Zheludev, A , Yan, Z , Kato, Yasuyuki , Murai, N , Ohira-Kawamura, S , Gvasaliya, S , Batista, C D

in Antiferromagnetism / Excitation / Inelastic scattering / Ising model / Lattice vibration / Low temperature / Magnons / Monte Carlo simulation / Neutron scattering

2025

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$Wannier states and spin supersolid physics in the triangular antiferromagnet K\$_2\$Co(SeO\$_3\$)\$_2\$$

Wannier states and spin supersolid physics in the triangular antiferromagnet K\$_2\$Co(SeO\$_3\$)\$_2\$

by Chinellato, Leandro M , Balz, Christian , Zhu, M , Romerio, V , Zheludev, A , Yan, Z , Kato, Yasuyuki , Murai, N , Ohira-Kawamura, S , Gvasaliya, S , Batista, C D

in Antiferromagnetism / Excitation / Inelastic scattering / Ising model / Lattice vibration / Low temperature / Magnons / Monte Carlo simulation / Neutron scattering

2025

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$Wannier states and spin supersolid physics in the triangular antiferromagnet K\$_2\$Co(SeO\$_3\$)\$_2\$$

Paper

Wannier states and spin supersolid physics in the triangular antiferromagnet K\$_2\$Co(SeO\$_3\$)\$_2\$

Chinellato, Leandro M,

Balz, Christian,

Zhu, M,

Romerio, V,

Zheludev, A,

Yan, Z,

Kato, Yasuyuki,

Murai, N,

Ohira-Kawamura, S,

Gvasaliya, S,

Batista, C D

2025

Overview

We combine ultra-high-resolution inelastic neutron scattering and quantum Monte Carlo simulations to study thermodynamics and spin excitations in the spin-supersolid phase of the triangular lattice XXZ antiferromagnet K\$_2\$Co(SeO\$_3\$)\$_2\$ under zero and non-zero magnetic field. BKT transitions signaling the onset of Ising and supersolid order are clearly identified, and the Wannier entropy is experimentally recovered just above the supersolid phase. At low temperatures, with an experimental resolution of about 23 \$\$eV, no discrete coherent magnon modes are resolved within a broad scattering continuum. Alongside gapless excitations, a pseudo-Goldstone mode with a 0.06 meV gap is observed. A second, higher-energy continuum replaces single-spin-flip excitations of the Ising model. Under applied fields, the continuum evolves into coherent spin waves, with Goldstone and pseudo-Goldstone sectors responding differently. The experiments and simulations show excellent quantitative agreement.

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Publisher

Cornell University Library, arXiv.org

Subject

Antiferromagnetism

/ Excitation

/ Inelastic scattering

/ Ising model

/ Lattice vibration

/ Low temperature

/ Magnons