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-nanometers 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.

中文翻译：

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通过原位分子插层增强 2H-TaS2 器件的超导性


客体物种插入范德华材料的间隙中通常会导致超导等有趣现象的出现。虽然插层诱导的超导性已在几种块状晶体中被报道，但在薄片中达到零电阻状态仍然具有挑战性。在这里，我们展示了一种简单的方法，通过原位插层增强与金电极接触的数十纳米厚的 2H-TaS ₂ 晶体的超导转变。我们的方法能够测量插层前后同一薄片的电特性，使我们能够精确识别客体物种对 TaS ₂ 输运特性的影响。我们发现，戊胺分子嵌入 TaS ₂ 薄片中会抑制电荷密度波，并增加超导转变，起始温度高于 3 K。此外，我们还表明，完全发展的零通过设计化学插层的条件，可以在薄片中实现抗性状态。我们的研究结果为化学定制插层化合物在可扩展量子技术中的集成铺平了道路。