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Topological surface conduction in Kondo insulator YbB12.
- Source :
- Journal of Physics D: Applied Physics; 10/7/2021, Vol. 54 Issue 40, p1-6, 6p
- Publication Year :
- 2021
-
Abstract
- Kondo insulators have recently aroused great interest because they are promising materials that host a topological insulator state caused by the strong electron interactions. Moreover, recent observations of the quantum oscillations in the insulating state of Kondo insulators have come as a great surprise. Here, to investigate the surface electronic state of a prototype Kondo insulator YbB<subscript>12</subscript>, we measured the transport properties of single crystals and microstructures. In all samples, the temperature dependence of the electrical resistivity is insulating at high temperatures and the resistivity exhibits a plateau at low temperatures. The magnitude of the plateau value decreases with reducing sample thickness, which is quantitatively consistent with the surface electronic conduction in the bulk insulating YbB<subscript>12</subscript>. Moreover, the magnetoresistance of the microstructures exhibits a weak-antilocalization effect at low field. These results are consistent with the presence of a topologically protected surface state, suggesting that YbB<subscript>12</subscript> is a candidate material for a topological Kondo insulator. The high field resistivity measurements up to µ<subscript>0</subscript>H = 50 T of the microstructures provide supporting evidence that the quantum oscillations of the resistivity in YbB<subscript>12</subscript> occurs in the insulating bulk. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00223727
- Volume :
- 54
- Issue :
- 40
- Database :
- Complementary Index
- Journal :
- Journal of Physics D: Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 151681022
- Full Text :
- https://doi.org/10.1088/1361-6463/ac10d9