On the use of STM superconducting tips at very low temperatures
On the use of STM superconducting tips at very low temperatures
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DOI：
10.1140/epjb/e2004-00273-y
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发表时间：
2004-08-01
影响因子：
1.6
通讯作者：
Vieira, S
中科院分区：
文献类型：
--
作者：
Rodrigo, JG;Suderow, H;Vieira, S
我们报道了用原位制备的超导尖端作为对电极在超导体中进行高质量的局域隧道光谱测量。这些实验是在非常低的温度下使用稀释冰箱和氦-3低温恒温器进行的。用Al的超导针尖和样品获得的光谱表明，我们的装置的光谱分辨率为15微伏。在观察到隧道区(铅和铝尖端)约瑟夫森电流之后，我们讨论了用原子尺寸分辨率扫描约瑟夫森光谱的可行性。文中还报道了这些超导尖端在外加磁场下的新应用。
We report on high quality local tunnel spectroscopy measurements in superconductors using in-situ fabricated superconducting tips as counterelectrode. The experiments were made at very low temperatures using a dilution refrigerator and a He-3 cryostat. Spectra obtained with superconducting tip and sample of Al show that the spectroscopic resolution of our set-up is of 15 mueV. Following the observation of Josephson current in tunnelling regime (with tips of Pb and of Al), we discuss the feasibility of Scanning Josephson Spectroscopy with atomic size resolution. Experiments showing new applications of these superconducting tips under applied external magnetic fields are also reported.