Open AccessUniaxial and fourfold basal anisotropy in GdRh2Si2
Author(s) -
D. Ehlers,
Kristin Kliemt,
C. Krellner,
C. Geibel,
J. Sichelschmidt
Publication year - 2020
Publication title -
journal of physics. condensed matter
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 228
eISSN - 1361-648X
pISSN - 0953-8984
DOI - 10.1088/1361-648x/abb17d
Subject(s) - anisotropy , condensed matter physics , magnetocrystalline anisotropy , antiferromagnetism , tetragonal crystal system , ferromagnetic resonance , magnetic anisotropy , plane (geometry) , resonance (particle physics) , spin (aerodynamics) , materials science , physics , chemistry , crystallography , magnetic field , crystal structure , optics , geometry , atomic physics , mathematics , magnetization , quantum mechanics , thermodynamics
The magnetocrystalline anisotropy of GdRh 2 Si 2 is examined in detail via the electron spin resonance (ESR) of its well-localised Gd 3+ moments. Below T N = 107 K, long range magnetic order sets in with ferromagnetic layers in the ( aa )-plane stacked antiferromagnetically along the c -axis of the tetragonal structure. Interestingly, the easy-plane anisotropy allows for the observation of antiferromagnetic resonance at X- and Q-band microwave frequencies. In addition to the easy-plane anisotropy we have also quantified the weaker fourfold anisotropy within the easy plane. The obtained resonance fields are modelled in terms of eigenoscillations of the two antiferromagnetically coupled sublattices. Conversely, this model provides plots of the eigenfrequencies as a function of field and the specific anisotropy constants. Such calculations have rarely been done. Therefore our analysis is prototypical for other systems with fourfold in-plane anisotropy. It is demonstrated that the experimental in-plane ESR data may be crucial for a precise knowledge of the out-of-plane anisotropy.