Magnetic field-induced phases and spin Hamiltonian in Cs2CoBr4

L. Facheris; S. D. Nabi; K. Yu. Povarov; Z. Yan; A. Glezer Moshe; U. Nagel; T. Rõõm; A. Podlesnyak; E. Ressouche; K. Beauvois; J. R. Stewart; P. Manuel; D. Khalyavin; F. Orlandi; A. Zheludev

Magnetic field-induced phases and spin Hamiltonian in Cs2CoBr4

Strongly Correlated Electrons 2024-03-15 v2

Authors: L. Facheris , S. D. Nabi , K. Yu. Povarov , Z. Yan , A. Glezer Moshe , U. Nagel , T. Rõõm , A. Podlesnyak , E. Ressouche , K. Beauvois , J. R. Stewart , P. Manuel , D. Khalyavin , F. Orlandi , A. Zheludev

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Abstract

Magnetic structures and spin excitations are studied across the phase diagram of the geometrically frustrated S = 3/2 quantum antiferromagnet Cs2CoBr4 in magnetic fields applied along the magnetic easy axis, using neutron diffraction, inelastic neutron scattering and THz absorption spectroscopy. The data are analyzed, where appropriate, using extended SU (4) linear spin wave theory. A minimal magnetic Hamiltonian is proposed based on measurements in the high field polarized state. It deviates considerably from the previously considered models. Additional dilatometry experiments highlight the importance of magnetoelastic coupling in this system.

Keywords

geometrically frustrated magnets cs2cobr4 spin hamiltonian neutron scattering thz spectroscopy magnetoelastic coupling

Cite

@article{arxiv.2311.10535,
  title  = {Magnetic field-induced phases and spin Hamiltonian in Cs2CoBr4},
  author = {L. Facheris and S. D. Nabi and K. Yu. Povarov and Z. Yan and A. Glezer Moshe and U. Nagel and T. Rõõm and A. Podlesnyak and E. Ressouche and K. Beauvois and J. R. Stewart and P. Manuel and D. Khalyavin and F. Orlandi and A. Zheludev},
  journal= {arXiv preprint arXiv:2311.10535},
  year   = {2024}
}

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14 pages, 10 figures, Accepted to Phys. Rev. B

Magnetic field-induced phases and spin Hamiltonian in Cs2CoBr4

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