Hall coefficient diagnostics of surface state in pressurized SmB6

Abstract

In this study, we report the first results of the high-pressure Hall coefficient (RH) measurements in the putative topological Kondo insulator SmB6 up to 37 GPa. Below 10 GPa, our data reveal that RH(T) exhibits a prominent peak upon cooling below 20 K. Remarkably, the temperature at which surface conduction dominates coincides with the temperature of the peak in RH(T). The temperature dependent resistance and Hall coefficient can be well fitted by a two-channel model with contributions from the metallic surface and the thermally activated bulk states. When the bulk of SmB6 becomes metallic and magnetic at ~ 10 GPa, both the RH(T) peak and the resistance plateau disappear simultaneously. Our results indicate that the RH(T) peak is a fingerprint to diagnose the presence of a metallic surface state in SmB6. The high-pressure magnetic state of SmB6 is robust to 180 GPa, and no evidence of superconductivity is observed in the metallic phase.

arXiv comment15 pages, 4 figures

References in corpus (28)

• Topological Insulators
• Conventional superconductivity at 203 K at high pressures
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Topological Kondo Insulators
• Large bulk resistivity and surface quantum oscillations in the topological insulator Bi2Te2Se
• Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
• Reemerging superconductivity at 48 K across quantum criticality in iron chalcogenides
• 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
• Unconventional Fermi surface in an insulating state
• A theory of Topological Kondo Insulators
• 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
• Polarity-driven surface metallicity in SmB${}_6$
• Tuning bulk and surface conduction in topological Kondo insulator SmB6
• Hybridization gap and Fano resonance in SmB${}_6$
• Sn-doped Bi1.1Sb0.9Te2S, a bulk topological insulator with ideal properties
• Emergence of a coherent in-gap state in SmB6 Kondo insulator revealed by scanning tunneling spectroscopy
• 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
• The energy gap of intermediate-valent SmB6 studied by point-contact spectroscopy
• Quantum oscillations in flux-grown SmB6 with embedded aluminum
• Topological surface states interacting with bulk excitations in the Kondo insulator SmB${}_6$ revealed via planar tunneling spectroscopy
• Valence and magnetic ordering in intermediate valence compounds : TmSe versus SmB6
• Pressure-resistant intermediate valence in Kondo insulator SmB6
• Puzzle maker in SmB6: accompany-type valence fluctuation state

Cited by in corpus (2)

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