Enhanced Superconductivity in 2H-TaS2 Devices Through in-situ Molecular Intercalation

TL;DR

This paper demonstrates a simple in-situ intercalation method to enhance superconductivity in 2H-TaS2 flakes, achieving zero resistance and higher transition temperatures, which could advance scalable quantum device applications.

Contribution

It introduces a novel in-situ intercalation technique for 2H-TaS2 flakes, enabling precise control and measurement of superconductivity enhancement in thin-layer devices.

Findings

Intercalation of amylamine suppresses charge density waves in TaS2.

Superconducting transition temperature exceeds 3 K after intercalation.

Zero-resistance state achieved in chemically intercalated flakes.

Abstract

The intercalation of guest species into the gap of van der Waals materials often leads to the emergence of intriguing phenomena, such as superconductivity. While intercalation-induced superconductivity has been reported in several bulk crystals, reaching a zero-resistance state in flakes remains challenging. Here, we show a simple method for enhancing the superconducting transition in tens-of-nm thick 2H-TaS2 crystals contacted by gold electrodes through in-situ intercalation. Our approach enables measuring the electrical characteristics of the same flake before and after intercalation, permitting us to precisely identify the effect of the guest species on the TaS2 transport properties. We find that the intercalation of amylamine molecules into TaS2 flakes causes a suppression of the charge density wave and an increase in the superconducting transition, with an onset temperature above 3 K. Additionally, we show that a fully developed zero-resistance state can be achieved in flakes by engineering the conditions of the chemical intercalation. Our findings pave the way for the integration of chemically tailored intercalation compounds in scalable quantum technologies.