Abstract
We present the results of a systematic investigation of the magnetic properties of the three-dimensional Kondo topological insulator ${\mathrm{SmB}}_{6}$ using magnetization and muon-spin relaxation/rotation ($\ensuremath{\mu}$SR) measurements. The $\ensuremath{\mu}$SR measurements exhibit magnetic field fluctuations in ${\mathrm{SmB}}_{6}$ below $\ensuremath{\sim}15$ K due to electronic moments present in the system. However, no evidence for magnetic ordering is found down to 19 mK. The observed magnetism in ${\mathrm{SmB}}_{6}$ is homogeneous in nature throughout the full volume of the sample. Bulk magnetization measurements on the same sample show consistent behavior. The agreement between $\ensuremath{\mu}$SR, magnetization, and NMR results strongly indicate the appearance of intrinsic bulk magnetic in-gap states associated with fluctuating magnetic fields in ${\mathrm{SmB}}_{6}$ at low temperature.
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