Magnetic Resonance in the Quasi-2D Square Lattice Easy-Plane Antiferromagnet Ba2MnGe2O7

We report results of a multi-frequency (0.8–60 GHz) electron spin resonance study of the spin dynamics in the quasi-2D square lattice antiferromagnet Ba 2 MnGe 2 O 7 both in antiferromagnetically ordered and paramagnetic phases. We directly observe two zero-field gaps in the excitation spectrum of t...

Full description

Saved in:
Bibliographic Details
Published in:Journal of experimental and theoretical physics 2023-10, Vol.137 (4), p.542-554
Main Authors: Glazkov, V. N., Krasnikova, Yu. V., Rodygina, I. K., Hemmida, M., Hirrle, M., Krug von Nidda, H.-A., Masuda, T.
Format: Article
Language:English
Subjects:
Anisotropy
Antiferromagnetism
Classical and Quantum Gravitation
Electron paramagnetic resonance
Electron spin
Elementary Particles
Excitation spectra
Field strength
Hyperfine structure
Low temperature
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theory
Relativity Theory
Solid State Physics
Spin dynamics
Spin resonance
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report results of a multi-frequency (0.8–60 GHz) electron spin resonance study of the spin dynamics in the quasi-2D square lattice antiferromagnet Ba 2 MnGe 2 O 7 both in antiferromagnetically ordered and paramagnetic phases. We directly observe two zero-field gaps in the excitation spectrum of the ordered phase, the larger one being due to easy-plane anisotropy, and the smaller one indicates the presence of fourth-order in-plane anisotropy probably related to the multiferroic properties of this compound. We observe effects of hyperfine interaction on the electron spin resonance spectra in the antiferromagnetically ordered state, which turns out to be comparable with in-plane anisotropy. The hyperfine field strength is found from the observed low-temperature electron spin resonance data. The spin dynamics of the paramagnetic phase is characterized by strong broadening of the ESR absorption line, which can be ascribed to the vortex dynamics of a 2D magnet.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776123100163