Low-dimensional materials exhibit exotic properties and have attracted widespread attention. However, many low-dimensional materials are highly sensitive to air, making it challenging to investigate their intrinsic properties with ex situ measurements. To overcome such challenges, here, we developed a system combined with sample growth, electrode deposition, and in situ electrical transport measurement under ultra-high vacuum condition. The in situ deposition of electrodes enables desired ohmic electrical contacts between the probes and samples, which allows continuous temperature dependent resistance (R-T) measurements. Combined with a scanning tunneling microscope, surface morphology, electronic structure, and electrical transport properties of the same sample can be systematically investigated. We demonstrate the performance of this in situ electrical transport measurement system with three-unit-cell thick FeSe films grown on Nb-doped SrTiO3(001) substrates, where a low-noise R-T curve with a zero-resistance superconducting transition temperature of ∼30 K is observed.

中文翻译：

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超高真空下原位电输运测量系统

低维材料表现出奇特的特性并引起了广泛的关注。然而，许多低维材料对空气高度敏感，因此很难通过非原位测量来研究它们的内在特性。为了克服这些挑战，在这里，我们开发了一种在超高真空条件下结合样品生长、电极沉积和原位电传输测量的系统。电极的原位沉积可实现探针和样品之间所需的欧姆电接触，从而实现连续的温度相关电阻 (RT) 测量。结合扫描隧道显微镜，可以系统地研究同一样品的表面形态、电子结构和电传输特性。