No abstract

No abstract

No abstract

liB spin-lattice relaxation measurements have been carried out in SmB 6 samples with large low-temperature resistivities.Above 15 K the relaxation is activated, with approximately the same gap (%6 meV) as found previously in transport and optical measurements.4f spin fluctuations apparently dominate the relaxation, so that these results give strong evidence for 4f-conduction band hybridization at the gap edge.An anomalous peak in the relaxation rate was observed at ~5 K, which is teDtatively attributed to fluctuations of "remagnetized" Sm 3+ ions near Sm-site vacancies.

No abstract