Irreversible proliferation of magnetic moments at cleaved surfaces of the topological Kondo insulator SmB6

Abstract

The compound SmB${}_6$ is the best established realization of a topological Kondo insulator, in which a topological insulator state is obtained through Kondo coherence. Recent studies have found evidence that the surface of SmB${}_6$ hosts ferromagnetic domains, creating an intrinsic platform for unidirectional ballistic transport at the domain boundaries. Here, surface-sensitive X-ray absorption (XAS) and bulk-sensitive resonant inelastic X-ray scattering (RIXS) spectra are measured at the Sm N${}_{4,5}$-edge, and used to evaluate electronic symmetries, excitations and temperature dependence near the surface of cleaved samples. The XAS data show that the density of large-moment atomic multiplet states on a cleaved surface grows irreversibly over time, to a degree that likely exceeds a related change that has recently been observed in the surface 4f orbital occupation.

References in corpus (29)

• Topological Insulators
• Topological Insulators in Three Dimensions
• Resonant Inelastic X-ray Scattering Studies of Elementary Excitations
• Magnetoelectric polarizability and axion electrodynamics in crystalline insulators
• Topological Kondo Insulators
• Dynamical Axion Field in Topological Magnetic Insulators
• Inverse Spin-Galvanic Effect in a Topological-Insulator/Ferromagnet Interface
• Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
• Correlated Topological Insulators with Mixed Valence
• Topological surface state in the Kondo Insulator Samarium Hexaboride
• Observation of in-gap surface states in the Kondo insulator SmB6 by photoemission
• Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
• Hybridization gap and Fano resonance in SmB${}_6$
• Momentum-Dependent Hybridization Gap and dispersive in-gap state of The Kondo Semiconductor SmB6
• One-dimensional edge state transport in a topological Kondo insulator
• Correlation between bulk thermodynamic measurements and the low temperature resistance plateau in SmB6
• The importance of Charge Fluctuations for the Topological Phase in SmB${}_6$
• Exotic Kondo crossover in a wide temperature region in the topological Kondo insulator SmB6 revealed by high-resolution ARPES
• SmB6 Photoemission: Past and Present
• Valence and magnetic ordering in intermediate valence compounds : TmSe versus SmB6
• Coexistence of Bound and Virtual-bound States in Shallow-core to Valence Spectroscopies
• Pressure-resistant intermediate valence in Kondo insulator SmB6
• Racah materials: role of atomic multiplets in intermediate valence systems
• Temperature Dependence of Linked Gap and Surface State Evolution in the Mixed Valent Topological Insulator SmB6
• Valence Characterization of Surface and Subsurface Region in SmB6
• Multiplet resonance lifetimes in resonant inelastic X-ray scattering involving shallow core levels
• Experimental signatures of phase interference and sub-femtosecond time dynamics on the incident energy axis of resonant inelastic X-ray scattering
• Charge transfer excitations in VUV and soft X-ray resonant scattering spectroscopies
• From bad metal to Kondo insulator: temperature evolution of the optical properties of SmB${}_6$

Cited by in corpus (3)

• Chemical and valence reconstruction at the surface of SmB6 revealed with resonant soft x-ray reflectometry
• Robust surface states and coherence phenomena in magnetically alloyed SmB6
• Phase stability in SmB${}_6$