Observation of the temperature dependence of the energy gap in SmB6 by the EPR method
Al'tshuler T. S. , Mironov V. N. , Khaliullin G. G. , Khomskii D. I.
The EPR of Gd and Eu impurities in the compound SmB6 with intermediate valency is investigated. It is established that the gap in the electron spectrum, equal to ~ 50 К at Τ = 0, decreases with increasing temperature and apparently vanishes at T~ 150 K.