Coupled weak ferromagnetic-paramagnetic excitations in (Gd 0.5Eu0.5)2CuO4
- Author(s): Fainstein, A;
- Tovar, M;
- Fisk, Z
- et al.
Published Web Locationhttps://doi.org/10.1088/0953-8984/4/6/024
The electron paramagnetic resonance spectra of Gd3+ in single crystals of (Gd0.5Eu0.5)2CuO4 show an anomalous anisotropy for temperatures below the magnetic ordering of the Cu ions (T approximately=280 K). The authors have performed a detailed experimental study of this feature, and they discuss their results in terms of a model that assumes a weak Heisenberg interaction between Cu and Gd moments. The authors show that that anisotropy is a consequence of the dynamic coupling of the Gd3+ paramagnetic mode with a weak ferromagnetic mode originating in the Cu magnetic moments.