Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Poster Session: Correlated Electrons 1
TT 17.3: Poster
Montag, 1. April 2019, 15:00–18:30, Poster D
Magnetic anisotropy in GdRh2Si2 probed by antiferromagnetic resonance — •Dieter Ehlers1, Kristin Kliemt2, Cornelius Krellner2, Christoph Geibel3, and Jörg Sichelschmidt3 — 1Experimentalphysik V, EKM, Universität Augsburg, 86135 Augsburg — 2Physikalisches Institut, Goethe-Universität Frankfurt am Main, 60438 Frankfurt am Main — 3Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden
GdRh2Si2 exhibits a complicated magnetocrystalline anisotropy [1] of well-localized Gd3+ moments. Below TN = 107 K [2] long range magnetic order sets in with ferromagnetic layers in the ab-plane stacked antiferromagnetically along the c-axis of the tetragonal structure. Interestingly, the strong 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 a 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. An interesting perspective is the application of a similar model for understanding the magnetic ground state of the Kondo system YbRh2Si2.
J. Sichelschmidt et al., Phys. Rev. B 97, 214424 (2018)
K. Kliemt and C. Krellner, J. Cryst. Growth. 419, 37 (2015)