用于稀释制冷机的扫描隧道显微镜
A Scanning Tunneling Microscope for a Dilution Refrigerator
摘要：
我们提出了一个自制的扫描隧道显微镜，已被附加到稀释冰箱的混合室的主要特点。它允许扫描隧道显微镜和光谱测量下降到低温恒温器的基础温度，T约。30 mK，外加磁场高达13 T。高度有序的热解石墨（HOPG）和二硫属化物超导体NbSe 2的地形已被成像的原子分辨率下降到T约。50 mK，由样品附近的电阻温度计测定。作为在磁场中成功运行的试验，本文研究了低磁场中超导NbSe_2的磁通线晶格。Abrikosov晶格的晶格常数显示了预期的场依赖性B^{-0.5}，STS模式下的测量清楚地显示了涡核中Andreev束缚态的态密度。
英文摘要：
We present the main features of a home-built scanning tunneling microscope that has been attached to the mixing chamber of a dilution refrigerator. It allows scanning tunneling microscopy and spectroscopy measurements down to the base temperature of the cryostat, T approx. 30mK, and in applied magnetic fields up to 13T. The topography of both highly-ordered pyrolytic graphite (HOPG) and the dichalcogenide superconductor NbSe2 have been imaged with atomic resolution down to T approx. 50mK as determined from a resistance thermometer adjacent to the sample. As a test for a successful operation in magnetic fields, the flux-line lattice of superconducting NbSe2 in low magnetic fields has been studied. The lattice constant of the Abrikosov lattice shows the expected field dependence B^{-0.5} and measurements in the STS mode clearly show the superconductive density of states with Andreev bound states in the vortex core.
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