Abstract
The spin-flip scattering (SFS) between conduction and Eu 2 + 4 f 7 ( S 7 / 2 8 ) electrons in the paramagnetic phase of EuB 6 ( T ⩾ T C ≈ 15 K ) is studied by electron spin resonance (ESR) and magneto-resistance (MR) experiments. The observed Dysonian resonance suggests a metallic environment for the Eu 2 + ions. ESR at high field, H ≅ 12.05 kG ( ν ≅ 33.9 GHz ), shows an anisotropic line width with cubic symmetry. ESR at low-field, 1.46 kG (4.1 GHz) and 3.35 kG (9.5 GHz), shows broader line width and smaller anisotropy than at higher field. The narrowing and anisotropy of the line width at high fields are indicative of a homogeneous resonance where the line width is mainly governed by the SFS mechanism due to the exchange interaction between Eu 2 + 4 f 7 and conduction electrons. Besides the negative MR, we found an anisotropic MR with cubic symmetry. These results are interpreted in terms of magnetic polaron and Fermi surface effects.
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