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We report a systematic study on the thickness-dependent superconductivity and transport properties in exfoliated layered topological superconductor  β -PdBi 2 . The superconducting transition temperature  T  c  is found to decrease with the decreasing thickness. Below a critical thickness of 45 nm, the superconductivity is suppressed, but followed by an abrupt resistance jump near  T  c , which is in opposite to the behavior in a superconductor. We attribute suppressed  T  c  to the enhanced disorder as the thickness decreases. The possible physical mechanisms were discussed for the origination of sharply increased resistance in thinner  β -PdBi 2  samples.

Thickness Dependence of Superconductivity in Layered Topological Superconductor β-PdBi2