Suppression of magnetic excitations near the surface of the topological Kondo insulator SmB6

Abstract

We present a detailed investigation of the temperature and depth dependence of the magnetic properties of 3D topological Kondo insulator SmB6 , in particular near its surface. We find that local magnetic field fluctuations detected in the bulk are suppressed rapidly with decreasing depths, disappearing almost completely at the surface. We attribute the magnetic excitations to spin excitons in bulk SmB6 , which produce local magnetic fields of about ~1.8 mT fluctuating on a time scale of ~60 ns. We find that the excitonic fluctuations are suppressed when approaching the surface on a length scale of 40-90 nm, accompanied by a small enhancement in static magnetic fields. We associate this length scale to the size of the excitonic state.

arXiv comment5 pages, 5 figures, accepted for publication as a Rapid Communication in Phys. Rev. B

References in corpus (24)

• Topological Kondo Insulators
• musrfit: A free platform-independent framework for muSR data analysis
• Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
• Low-temperature surface conduction in the Kondo insulator SmB${}_6$
• Correlated Topological Insulators with Mixed Valence
• Topological surface state in the Kondo Insulator Samarium Hexaboride
• Robust Surface Hall Effect and Nonlocal Transport in SmB6: Indication for an Ideal Topological Insulator
• Observation of in-gap surface states in the Kondo insulator SmB6 by photoemission
• A theory of Topological Kondo Insulators
• Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
• Surface and Bulk Electronic Structure of the Strongly Correlated System SmB${}_6$ and Implications for a Topological Kondo Insulator
• Cubic Topological Kondo Insulators
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Momentum-Dependent Hybridization Gap and dispersive in-gap state of The Kondo Semiconductor SmB6
• Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6
• One-dimensional edge state transport in a topological Kondo insulator
• Correlation between bulk thermodynamic measurements and the low temperature resistance plateau in SmB6
• Anomalous 3D bulk AC conduction within the Kondo gap of SmB${}_6$ single crystals
• Large, high quality single-crystals of the new Topological Kondo Insulator, SmB6
• SmB6 Photoemission: Past and Present
• Hysteretic Magnetotransport in SmB6 at Low Magnetic Fields
• Magnetotransport Measurements of the Surface States of Samarium Hexaboride using Corbino Structures
• Low-temperature magnetic fluctuations in the Kondo insulator SmB6
• Dynamics at T -> 0 in the half-integer isotropic high spin molecules

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• Magnetic impurities in Kondo insulators: An application to samarium hexaboride
• Intrinsic Low-Temperature Magnetism in SmB6
• The anomalous antiferromagnetic topological phase in pressurized SmB6
• Quantum spin fluctuations in the bulk insulating state of pure and Fe-doped SmB6
• Direct observation of surface state thermal oscillation in SmB6 oscillators
• Second and third harmonics generation by coherent sub-THz radiation at induced Lifshitz transitions in gapped bilayer graphene
• Slow crystalline electric field fluctuations in the Kondo lattice SmB${}_6$
• Direct measurement of a remnant Fermi surface in SmB6