Comprehensive surface magnetotransport study of SmB6

• DOI: 10.1103/physrevb.101.155109
• Publication Date: 2020-04-09T13:32:03Z
• Authors: Y. S. Eo; S. Wolgast; A. Rakoski; D. Mihaliov; B. Y. Kang; M. S. Song; B. K. Cho; M. Ciomaga Hatnean; G. Balakrishnan; Z. Fisk; S. R. Saha; X. Wang; J. Paglione; Ç. Kurdak
• Keywords: Topological insulator; Crystal (programming language)

After the theoretical prediction that ${\mathrm{SmB}}_{6}$ is a topological Kondo insulator, there has been an explosion of studies on surface. However, not yet agreement even most basic quantities such as surface carrier density and mobility. In this paper, we carefully revisit Corbino disk magnetotransport to find those transport parameters. We first show subsurface cracks exist in crystals, arising both from preparation during crystal growth. provide evidence these hidden are additional conduction channels, large disagreement between earlier may originate previous interpretations taking extra path into account. update more reliable data than one (S. Wolgast et al., Phys. Rev. B 92, 115110) orders-of-magnitude disagreements mobility come geometry rather intrinsic sample quality. From study, updated estimate $2.71\ifmmode\times\else\texttimes\fi{}{10}^{13}$ (1/${\mathrm{cm}}^{2}$) 104.5 (${\mathrm{cm}}^{2}$/$\mathrm{V}\phantom{\rule{0.16em}{0ex}}\mathrm{sec}$), respectively. compare our results with other By comparison, insight agreements previously reported angle-resolved photoemission spectroscopy, scanning tunneling microscopy, magnetotorque quantum oscillations measurements.