Imaging atomically resolved surfaces and performing spectroscopy of exotic surfaces at cryogenic temperature in the presence of the magnetic field is an engineering challenge. Additionally, performing these measurements in an all-cryogen-free environment compounds the above complexity due to the associated vibration and acoustic noise generated by the running of cryogenic cold heads. We here report successful integration of a cryogen-free scanning tunneling microscope (STM) with a cryogen-free superconducting vector-magnet, connected to an ultra-high vacuum cluster assembly for in situ sample transfer. We present details of the integration involving vibration and electrical noise isolation procedures allowing for operation of the STM at extremely low noise levels below 30 $\text{fA}/\sqrt{\text{Hz}}$ during normal operations of the complete vacuum-line assembly with multiple turbomolecular pumps. We demonstrate the above STM capability at cryogenic temperature and in the presence of the magnetic field through atomic resolution imaging of graphite and thin films of gold on the mica substrate transferred in situ to the STM chamber. We also demonstrate spectroscopy signatures of the superconducting gap in MgB₂ thin films. The design of our in-house customized cluster-vacuum-line assembly provides unsought opportunities in continuous uninterrupted imaging of ultra-clean in-vacuum grown surfaces without the need for cryogenic refills in either the STM or the magnet.

中文翻译：

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低噪声，无制冷剂的扫描隧道显微镜-超导磁体系统，具有真空样品传输功能

在磁场存在下，在低温下对原子分辨的表面进行成像并对奇异的表面进行光谱分析是一项工程挑战。另外，由于低温冷头的运行会产生相关的振动和声噪声，因此在全无制冷剂的环境中进行这些测量会增加上述复杂性。我们在这里报告了无致冷剂扫描隧道显微镜（STM）与无致冷剂超导矢量磁铁的成功集成，超导矢量磁铁连接到用于原位样品转移的超高真空簇组件。我们介绍了涉及振动和电气噪声隔离程序的集成细节，从而允许STM在低于30的极低噪声水平下运行$\text{F A}/\sqrt{\text{赫兹}}$在带有多个涡轮分子泵的完整真空管线组件的正常运行期间。我们通过低温原位转移到STM腔室的云母基板上的石墨和金薄膜的原子分辨率成像，证明了在低温和磁场存在下的上述STM能力。我们还证明了MgB ₂薄膜中超导间隙的光谱学特征。我们内部定制的集束-真空生产线组件的设计为超洁净的真空内生长表面的连续不间断成像提供了未开发的机会，而无需在STM或磁体中进行低温填充。