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Mingxiang Xu,  Yoshihiko Takano, Takeshi Hatano, Masayo Kitahara, Daisuke Fujita

LT 23, Hiroshima, JAPAN. The fabrication of MgB2. superconducting STM tips. Mingxiang Xu,  Yoshihiko Takano, Takeshi Hatano, Masayo Kitahara, Daisuke Fujita. National Institute for Materials Science, Tsukuba, Japan.  E-mail: XU.Mingxiang@nims.go.jp. ABSTRACT.

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Mingxiang Xu,  Yoshihiko Takano, Takeshi Hatano, Masayo Kitahara, Daisuke Fujita

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  1. LT 23, Hiroshima, JAPAN The fabrication of MgB2 superconducting STM tips Mingxiang Xu, Yoshihiko Takano, Takeshi Hatano, Masayo Kitahara, Daisuke Fujita National Institute for Materials Science, Tsukuba, Japan E-mail: XU.Mingxiang@nims.go.jp

  2. ABSTRACT • Reproducible, clean and stable MgB2 superconducting tips have been fabricated. • The quality of these tips has been verified by imaging the surface of a thin Au(111) film using a low temperature STM. • High-quality semi-atomically resolved STM images of the thin Au(111) film sample have been observed.

  3. BACKGROUND & MOTIVATIONS • Conventional STM studies for superconducting materials: superconductor/insulator/normal-metal (S/I/N) configuration. • Quasiparticle tunneling using a superconducting atomically sharp Nb tip: S/I/S measurements, OK! • MgB2: Suitable for use as STM tips? Feasible? • Josephson tunneling in SS-STM: Tunable Josephson junction !!

  4. Fig. 1. (a) Optical image of the MgB2 tip. (b) Enlarged image.

  5. Fig. 2. Schematic depiction of the experimental setup

  6. Fig. 3.

  7. Fig. 3. A wide-area STM image (104 × 104 nm2) at the constant-height mode (VT= -2.00 V, IT= 0.20 nA) of the reconstructed Au(111) surface observed at 30 K, clearly showing the steps of monoatomic height and the herringbone patterns.

  8. Further STM studiesby the MgB2 tip • MgB2 superconducting tip + MgB2 sample. • MgB2 two gaps nature. • SS-STM: Tunable Josephson junction.

  9. Fig. 4. Schematic depiction for further experiments

  10. CONCLUSION • Reproducible, clean and stable MgB2 superconducting tips have been fabricated. • MgB2: Suitable for use as STM tips, is feasible! • Application: Josephson tunneling in SS-STM: Tunable Josephson junction !!

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