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The search for topological states in strongly correlated electron systems hasrenewed the interest in the Kondo insulator SmB6. One of the most intriguingprevious results was an anomalous electron spin resonance spectrum in Gd-dopedSmB6. This spectrum was attributed to Gd2+ ions because it could be very welldecribed by a model considering a change in the valence from Gd3+ to Gd2+, adynamic Jahn-Teller effect and a 4f7 5d1 ground state in the Hamiltonian. Inour work, we have revisited this scenario using electron spin resonance andenergy dispersive X-ray spectroscopy measurements. Our results suggest that theresonance is produced by Gd2+ ions; however the resonance stems from anextrinsic oxide impurity phase that lies on the surface of the crystal.

Revisiting the Possible 4f7 5d1 Ground State of Gd Impurities in SmB6 by Electron Spin Resonance