Preparation of Superconducting Niobium Tips for Atomic-Resolution Scanning Tunneling Microscopy/Spectroscopy

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概要

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• We present a new reliable method to prepare superconducting niobium (Nb) tips for scanning tunneling microscopy/spectroscopy (STM/STS). Sharp Nb tips were fabricated by chemical etching using an electrolyte based on a hydrofluoric acid and hydrogen peroxide solution, followed by field evaporation utilizing field ion microscopy to remove Nb oxide layers from the tip apex. STM/STS measurements of Si(111) and Au(111) surfaces confirmed that the tips had atomic resolution capability together with bulk-like superconducting properties, indicating that the prepared Nb tips can be used as a unique probe for investigating local superconducting and magnetic properties on an atomic scale.

• 2010-02-25

著者

• Tetsuya Hasegawa

  Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan

• Tomihiro Hashizume

  World Premier International Research Center Initiative, Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan

• Ryota Shimizu

  Department of Chemistry, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan

• Taro Hitosugi

  World Premier International Research Center Initiative, Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan

• Noritaka Fukuo

  Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan

関連論文

• Carrier Compensation by Excess Oxygen Atoms in Anatase Ti0.94Nb0.06O2+δ Epitaxial Thin Films
• Preparation of Superconducting Niobium Tips for Atomic-Resolution Scanning Tunneling Microscopy/Spectroscopy

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