Nuclear spin relaxation, hybridization, and low-temperature 4f spin fluctuations in intermediate-valent SmB6
Abstract
11B spin-lattice relaxation measurements have been carried out in SmB6 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 tentatively attributed to fluctuations of "remagnetized" Sm3+ ions near Sm-site vacancies. © 1981.
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