Pressure-resistant intermediate valence in Kondo insulator SmB6

Abstract

Resonant x-ray emission spectroscopy (RXES) was used to determine the pressure dependence of the f-electron occupancy in the Kondo insulator SmB6. Applied pressure reduces the f-occupancy, but surprisingly, the material maintains a significant divalent character up to a pressure of at least 35 GPa. Thus, the closure of the resistive activation energy gap and onset of magnetic order are not driven by stabilization of an integer valent state. Over the entire pressure range, the material maintains a remarkably stable intermediate valence that can in principle support a nontrivial band structure.

References in corpus (24)

• Topological Kondo Insulators
• Topological Thouless Pumping of Ultracold Fermions
• 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
• Quantum oscillations in Kondo Insulator SmB${}_6$
• 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
• Cubic Topological Kondo Insulators
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Polarity-driven surface metallicity in SmB${}_6$
• Tuning bulk and surface conduction in topological Kondo insulator SmB6
• Emergence of a coherent in-gap state in SmB6 Kondo insulator revealed by scanning tunneling spectroscopy
• Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6
• Correlation between bulk thermodynamic measurements and the low temperature resistance plateau in SmB6
• Kondo hybridisation and the origin of metallic states at the (001) surface of SmB6
• Unified understanding of the valence transition in the rare-earth monochalcogenides under pressure
• Exotic Kondo crossover in a wide temperature region in the topological Kondo insulator SmB6 revealed by high-resolution ARPES
• Magnetotransport Measurements of the Surface States of Samarium Hexaboride using Corbino Structures
• Hysteretic Magnetotransport in SmB6 at Low Magnetic Fields
• Valence and magnetic ordering in intermediate valence compounds : TmSe versus SmB6
• Band symmetries of mixed-valence topological insulator: SmB6
• Low-temperature magnetic fluctuations in the Kondo insulator SmB6
• Surface properties of SmB6 from x-ray photoelectron spectroscopy

Cited by in corpus (22)

• 4$f$ crystal field ground state of the strongly correlated topological insulator SmB${}_6$
• Kondo insulator SmB6 under strain: surface dominated conduction near room temperature
• Bulk and surface electronic properties of SmB6: a hard x-ray photoelectron spectroscopy study
• Magnetic states in a three-dimensional topological Kondo insulator
• The anomalous antiferromagnetic topological phase in pressurized SmB6
• Novel Kondo-like behavior near magnetic instability in SmB${}_6$ : temperature and pressure dependences of Sm valence
• A RIXS investigation of the crystal-field splitting of Sm${}^{3+}$ in SmB${}_6$
• Pressure-Driven Valence Increase and Metallization in Kondo Insulator Ce${}_3$Bi${}_4$Pt${}_3$
• Irreversible proliferation of magnetic moments at cleaved surfaces of the topological Kondo insulator SmB6
• Many-body breakdown of indirect gap in topological Kondo insulators
• ${\mathcal{Z}}_2$ classification for a novel antiferromagnetic topological insulating phase in three-dimensional topological Kondo insulator
• Nonmagnetic-magnetic transition and magnetically ordered structure in SmS
• Hall coefficient diagnostics of surface state in pressurized SmB6
• Magnetic and topological transitions in three-dimensional topological Kondo insulator
• Mixed-valence state in the dilute-impurity regime of La-substituted SmB${}_6$
• Correlation Induced Magnetic Topological Phases in Mixed-Valence Compound SmB6
• Valence transition in topological Kondo insulator
• Mapping out the emergence of topological features in the highly alloyed topological Kondo insulators Sm${}_{1-x}{M}_x$B${}_6$ ($M$=Eu, Ce)
• f-electron charge densities probed using core level non-resonant inelastic x-ray scattering
• Direct measurement of a remnant Fermi surface in SmB6
• The role of the short range magnetic correlations on the gap opening of the topological Kondo insulators
• Reflection-Symmetry Protected Antiferromagnetic Topological Insulator in Three-Dimensional Heavy-Fermion Systems