Electron Spin Resonance of the ferromagnetic Kondo lattice CeRuPO
T. F\"orster, J. Sichelschmidt, C. Krellner, C. Geibel, and F., Steglich
TL;DR
This study uses Electron Spin Resonance to explore the spin dynamics of the ferromagnetic Kondo lattice CeRuPO, revealing how magnetic interactions and critical fluctuations affect resonance behavior across temperatures.
Contribution
It provides the first ESR observation of bulk Ce3+ resonance in a metallic Ce compound and analyzes its temperature-dependent behavior in relation to magnetic interactions.
Findings
Resonance observed below Tc at 14 K.
Spin relaxation influenced by critical fluctuations near Tc.
Interplay between RKKY exchange and crystal field anisotropy affects ESR parameters.
Abstract
The spin dynamics of the ferromagnetic Kondo lattice CeRuPO is investigated by Electron Spin Resonance (ESR) at microwave frequencies of 1, 9.4, and 34~GHz. The measured resonance can be ascribed to a rarely observed bulk Ce3+ resonance in a metallic Ce compound and can be followed below the ferromagnetic transition temperature Tc=14 K. At T>Tc the interplay between the RKKY-exchange interaction and the crystal electric field anisotropy determines the ESR parameters. Near Tc the spin relaxation rate is influenced by the critical fluctuations of the order parameter.
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