Abstract
In this work, we report the broad-band ferromagnetic resonance spectroscopy of EuSn2As2 single crystals at different temperatures in combination with magnetization measurements and structural characterization. We observe conventional collective acoustic resonance mode of the A-type antiferromagnetic canted state in the Eu sub-lattice, and its transition to the paramagnetic resonance above the ordering temperature. Furthermore, we observe reproducibly additional well-defined spectral line. The origin of the additional line remains unclear. However, its temperature dependence associates it with the magnetism in the Eu sub-lattice.
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