Abstract
Magnetic structures and spin excitations are studied across the phase diagram of the geometrically frustrated S = 3/2 quantum antiferromagnet Cs₂ CoBr₄ in magnetic fields applied along the magnetic easy axis, using neutron diffraction, inelastic neutron scattering, and terahertz 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 paramagnetic state. It deviates considerably from the previously considered models. Additional dilatometry experiments highlight the importance of magnetoelastic coupling in this system. Show more
Publication status
publishedExternal links
Journal / series
Physical Review BVolume
Pages / Article No.
Publisher
American Physical SocietySubject
Antiferromagnetism; Exchange interaction; Frustrated magnetism; Magnetic order; Magnetic phase transition; Magnons; Spin dynamics; Inelastic neutron scattering; Neutron diffraction; Spin wave theory; Terahertz spectroscopyMore
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ETH Bibliography
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