Here, we report the systematic study on the planar transport properties of the quasi-two-dimensional (quasi-2D) topological nodal-line semimetal candidate In0.93TaSe2. When rotating magnetic field in the plane, the anisotropic longitudinal resistance and planar Hall resistance are clearly observed and can be well described by the theoretical formulation of the planar Hall effect (PHE). Further analysis demonstrates that the anisotropic orbital resistance rather than the topological-nontrivial chiral anomaly plays a dominant role on the PHE in In0.93TaSe2. Our study provides another platform for understanding the mechanism of PHE, which may also be valuable for future planar Hall sensors based on quasi-2D materials.
Here, we report systematic studies on thickness-dependent magnetotransport properties of trigonal layered PtBi2. When the thickness decreases, the metallicity is gradually suppressed, and it ultimately displays a semiconductor-like behavior when the thickness is reduced to 22 nm. Interestingly, the magnetoresistance (MR) decreases gradually as well as the thickness decreases, followed by an abrupt increase in the 22 nm nanoflake. The Hall resistance demonstrates the distinct evolution of an electronic state on thickness, revealing that the carrier compensation mechanism may play a role on the large MR in the 22 nm PtBi2 nanoflake. The scanning transmission electron microscopy image clearly uncovers the surface reconstruction of trigonal PtBi2, and qualitative interpretation is proposed for understanding the thickness-dependent transport properties. Our results provide insight into the electronic properties in the low-dimensional limit of topological semimetal trigonal PtBi2.
We present the thickness dependence of magnetotransport study on the mechanically exfoliated topological superconductor candidate SnTaS2. As the thickness decreases, the superconducting transition temperature Tc is gradually suppressed and ultimately out of detection when the thickness is comparable to the superconducting coherence length. The enhanced disorder with the decrease in thickness is expected to play an important role on the suppressed Tc. Furthermore, the distinct weak antilocalization effect is observed in the SnTaS2 nanoflakes, and the temperature-dependent phase coherence length extracted from weak antilocalization agrees with strong electron–phonon scattering in the sample. Our results provide insight into the electronic properties in the low dimensional limit of topological superconductor candidate SnTaS2.
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