Kondo breakdown in the topological Kondo insulator SmB6 studied by point-contact Andreev reflection spectroscopy
Masanobu Shiga, Tsubasa Teramoto, Takurou Harada, Takuya Takahashi, Fumitoshi Iga, Tatsuya Kawae
DOI 10.1103/PhysRevB.108.195130 · Physical Review B
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Abstract
We studied the topological features in Kondo insulator SmB6 by point-contact Andreev reflection spectroscopy with a Nb probe tip. Below the superconducting transition of Nb, the spectra exhibited a narrow dip at around zero bias superposed on a broad asymmetric background caused by the Kondo resonance. The contact-size dependence of the spectra revealed that the width of the resonance is suppressed near the surface. The spin polarization in the surface state was ∼0.56, which is smaller than that in Bi-based topological insulators. These indicate that the Kondo breakdown plays a crucial role for the topological features, not only in the bulk state near the surface but also in the surface state on SmB6.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.2 | Pressure not reported | onset |
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