Thickness dependence of quantum transport in the topological superconductor candidate SnTaS2

Abstract

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.

Evidences of Topological Surface States in the Nodal-Line Semimetal SnTaS2 Nanoflakes

“…Obviously, the T c decreases slightly when the thickness is reduced from the bulk to 37 nm. Such behavior was generally attributed to the enhanced disorder as the thickness decreases. − Figure b shows the resistivity of various SnTaS 2 samples with different thicknesses when the magnetic field alone is applied to the c axis at T = 2 K. The inset is the atomic force microscope (AFM) image of a typical SnTaS 2 Hall bar device with a thickness of 37 nm. Interestingly, additional resistance oscillations were observed in SnTaS 2 nanoflakes but were absent in the bulk sample.…”

Planar Hall Effect in the Charge-Density-Wave Bi2Rh3Se2

“…[1] Numerous quantum materials have been discovered and extensively studied, including graphene, [2] superconductors such as AV3Sb5 (A = K, Rb, Cs), [3] UTe2, [4] topological semi-metals such as PtBi2, [5,6] ZrSiS, [7] and so on. Lately, two-dimensional ternary chalcogenides, such as PaTaSe2, [8,9] SnTaS2, [10,11] and InTaSe2, [12] have attracted a great deal of attention by their unique architecture, novel physical characteristics, and promising potential application in nanodevices. [13] Recently, the ternary chalcogenide Bi2Rh3Se2 was closely investigated for its fancy charge-density-wave and superconductivity.…”