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Quantum spin fluctuations in the bulk insulating state of pure and Fe-doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SmB</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>
The intermediate-valence compound ${\mathrm{SmB}}_{6}$ is a well-known Kondo insulator, in which the hybridization of itinerant $5d$ electrons with localized $4f$ electrons leads to a transition from metallic to insulating behavior at low temperatures. Recent studies suggest that ${\mathrm{SmB}}_{6}$ is a topological insulator, with topological metallic surface states emerging from a …