Easy-Plane Antiferromagnet in Tilted Field: Gap in Magnon Spectrum and Susceptibility

Motivated by recent experimental data on dichloro-tetrakis thiourea-nickel (DTN) [Soldatov et al., Phys. Rev. B 101 , 104410 (2020)], a model of antiferromagnet on a tetragonal lattice with single-ion easy-plane anisotropy in the tilted external magnetic field is considered. Using the smallness of t...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2023-07, Vol.137 (1), p.80-88
Main Authors: Shcherbakov, A. S., Utesov, O. I.
Format: Article
Language:English
Subjects:
Analysis
Anisotropy
Antiferromagnetism
Classical and Quantum Gravitation
Diamagnetism
Disorder
Elementary Particles
Energy gap
Magnetic fields
Magnetic permeability
Magnons
Order
Particle and Nuclear Physics
Phase Transition in Condensed System
Physics
Physics and Astronomy
Quantum Field Theory
Relativity Theory
Solid State Physics
Tetragonal lattice
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Summary:Motivated by recent experimental data on dichloro-tetrakis thiourea-nickel (DTN) [Soldatov et al., Phys. Rev. B 101 , 104410 (2020)], a model of antiferromagnet on a tetragonal lattice with single-ion easy-plane anisotropy in the tilted external magnetic field is considered. Using the smallness of the in-plane field component, we analytically address field dependence of the energy gap in “acoustic” magnon mode and transverse uniform magnetic susceptibility in the ordered phase. It is shown that the former is non-monotonic due to quantum fluctuations, which was indeed observed experimentally. The latter is essentially dependent on the “optical” magnon rate of decay on two magnons. At magnetic fields close to the one which corresponds to the center of the ordered phase, it leads to experimentally observed dynamical diamagnetism phenomenon.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776123070087