Enhanced Superconductivity in Restacked TaS₂ Nanosheets

Abstract

Since interface superconductivity was discovered at the interface between two insulating layers LaAlO₃ and SrTiO₃, such interface-induced superconducting systems have been a research hotspot in superconductivity. Here, we report homogeneous interfaces formed by stacking chemically exfoliated monolayer TaS₂ nanosheets randomly. Enhanced superconductivity of T_c = 3 K is observed, compared with 0.8 K of parent 2H-TaS₂. The measurement of heat capacity shows the increase of electronic specific-heat coefficient γ of restacked TaS₂ nanosheets compared to parent 2H-TaS₂ crystals. Density functional theory calculations indicate that increase and delocalization of electron states near the Fermi surface due to the homogeneous interfaces effects could account for the enhanced superconductivity.