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

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

preprint2020arXivOpen access
J. C. SouzaP. F. S. RosaU. BurkhardtM. KonigZ. FiskP. G. PagliusoS. WirthJ. Sichelschmidt
cond-mat.str-elcond-mat.mtrl-sci
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J. C. SouzaP. F. S. RosaU. BurkhardtM. KonigZ. FiskP. G. PagliusoS. WirthJ. Sichelschmidt

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