Low-temperature magnetic fluctuations in the Kondo insulator SmB6

Abstract

We present the results of a systematic investigation of the magnetic properties of the three-dimensional Kondo topological insulator SmB6 using magnetization and muon-spin relaxation/rotation (muSR) measurements. The muSR measurements exhibit magnetic field fluctuations in SmB6 below 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 SmB6 is homogeneous in nature throughout the full volume of the sample. Bulk magnetization measurements on the same sample show consistent behavior. The agreement between muSR, magnetization, and NMR results strongly indicate the appearance of intrinsic bulk magnetic in-gap states associated with fluctuating magnetic fields in SmB6 at low temperature.

arXiv comment5 pages, 5 figures

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• A Strongly-Interacting Dirac Liquid on the Surface of a Topological Kondo Insulator
• Suppression of magnetic excitations near the surface of the topological Kondo insulator SmB6
• Critical role of magnetic moments in heavy-fermion materials: revisiting mysteries of SmB${}_6$
• Valence and Spin fluctuations in Mn-doped ferroelectric BaTiO3
• Shubnikov-de Haas Oscillations and Nontrivial Topological State in a New Weyl Semimetal Candidate SmAlSi
• Diamagnetic Sm${}^{3+}$ in the topological Kondo insulator SmB${}_6$
• Intrinsic Low-Temperature Magnetism in SmB6
• Quantum spin fluctuations in the bulk insulating state of pure and Fe-doped SmB6
• Puzzle maker in SmB6: accompany-type valence fluctuation state
• Topology and Magnetism in the Kondo Insulator Phase Diagram
• Universal properties of the near-gap spectra of SmB6: dynamical mean-field calculations and photoemission experiments
• Slow crystalline electric field fluctuations in the Kondo lattice SmB${}_6$
• Importance of orbital fluctuations for the magnetic dynamics in heavy-fermion compound SmB${}_6$
• Direct measurement of a remnant Fermi surface in SmB6