# Signature of surface state coupling in thin films of the topological Kondo insulator SmB$_6$ from anisotropic magnetoresistance

@article{Petrushevsky2016SignatureOS,
title={Signature of surface state coupling in thin films of the topological Kondo insulator SmB\$\_6\$ from anisotropic magnetoresistance},
author={M. Petrushevsky and P. K. Rout and Georges L{\'e}vi and Amit Kohn and Y. Dagan},
journal={arXiv: Strongly Correlated Electrons},
year={2016},
pages={7}
}
• Published 1 December 2016
• Physics
• arXiv: Strongly Correlated Electrons
The temperature and thickness dependencies of the in-plane anisotropic magnetoresistance (AMR) of SmB$_6$ thin films are reported. We find that the AMR changes sign from negative ($\rho_{||} \rho_{\perp}$) at low temperatures. The temperature, T$_s$, at which this sign change occurs, decreases with increasing film thickness $t$ and T$_s$ vanishes for $t$ $>$ 30 nm. We interpret our results in the framework of a competition between two components: a negative bulk contribution and a positive…

## Figures from this paper

• L. Zhou
• Physics
Physical Review B
• 2019
Whether the surface states in ${\mathrm{SmB}}_{6}$ are topological is still a critical issue in the field of topological Kondo insulators. In the magneto-transport study of single crystalline
• Physics
Physical review letters
• 2018
The nontrivial feature and penetration depth of the topological surface states (TSS) in SmB_{6} were studied via spin pumping and show a unique film thickness dependence that suggests a TSS depth of ∼32  nm.
• Physics
Rare-Earth Borides
• 2021
Samarium hexaboride crystallizes in a simple cubic structure (space group #221, Pm-3m), but its properties are far from being straightforward. Initially classified as a Kondo insulator born out of
• Physics
• 2021
The authors report a planar Hall effect in Sr${}_{3}$SnO wherein the transverse voltage oscillates six times as a magnetic field is rotated once in the plane of the sample.
• Physics
• 2020
Samarium hexaboride (SmB 6 ) is an example of a Kondo insulator, in which strong electron correlations cause a band gap to open. SmB 6 hosts both a bulk insulating state and a conductive surface

## References

SHOWING 1-10 OF 36 REFERENCES

• Physics
• 2016
The strongly correlated Kondo insulator ${\mathrm{SmB}}_{6}$ is known for its peculiar low-temperature residual conduction, which has recently been demonstrated to arise from a robust metallic
• Physics
• 2014
Fabrication of smooth thin films of topological insulators with true insulating bulk are extremely important for utilizing their novel properties in quantum and spintronic devices. Here, we report
• Physics
Physical review letters
• 2015
By separately tuning bulk and surface conduction channels, it is shown conclusive evidence for a model with an insulating bulk and metallic surface states, with a crossover temperature that depends solely on the relative contributions of each conduction channel.
• Physics
Physical review letters
• 2014
It is proposed that the in-gap resonance state is due to a collective excitation in magnetic origin with the presence of spin-orbital coupling and mixed valence fluctuations in SmB6.
• Physics
Scientific reports
• 2013
These results serve as proof that at low temperatures SmB6 has a metallic surface that surrounds an insulating bulk, paving the way for transport studies of the surface state in this proposed TKI material.
• Physics
• 2013
We study the transport properties of the Kondo insulator SmB6 with a specialized configuration designed to distinguish bulk-dominated conduction from surface-dominated conduction. We find that as the
The electronic structure of SmB6 in high magnetic fields is traced and it is found that it does indeed have two-dimensional surface states, and this material is confirmed to be a topological insulator.
• Physics
Nature materials
• 2014
Thickness-dependent transport measurements on doped SmB6 are reported, and it is shown that magnetic and non-magnetic doping results in contrasting behaviour that supports the conclusion that SmB 6 shows virtually no residual bulk conductivity.
• Physics
Nano letters
• 2015
The large, tunable and bipolar in-plane AMR in BSTS devices provides the possibility of fabricating more sensitive logic and magnetic random access memory AMR devices.
• Physics
Physical review letters
• 2015
Results are presented which show that the decoupling of the localized moments at the surface disturbs the compensation between light and heavy electrons and dopes the Dirac cone.