Magnitnyy rezonans v kvazidvumernom antiferromagnetike na kvadratnoy reshetke Ba2MnGe2O7-Reference-Cited by-同舟云学术

Magnitnyy rezonans v kvazidvumernom antiferromagnetike na kvadratnoy reshetke Ba2MnGe2O7

Published:2023-12-15 Issue:4 Volume:164 Page:626-642
ISSN:0044-4510
Container-title:Журнал экспериментальной и теоретической физики
language:
Short-container-title:Žurnal èksperimentalʹnoj i teoretičeskoj fiziki

Author:

Glazkov V. N¹,Krasnikova Yu. V¹,Rodygina I. K¹,Khemmida M.²,Khirle M.²,Krug fon nidda Kh. -A²,Masuda T.³

Affiliation:

1. Kapitza Institute for Physical Problems, Russian Academy of Sciences

2. Experimental Physics V, University of Augsburg

3. Institute for Solid State Physics, The University of Tokyo

Abstract

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 Ba2MnGe2O7 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.

Publisher

The Russian Academy of Sciences

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