Low temperature STM/STS studies on MgB2

  • Xu M
  • Xiao Z
  • Takano Y
  • et al.
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Abstract

Scanning tunneling microscopy and spectroscopy (STM/STS) experiments on a high-density sintered MgB2 surface were performed at 4.2 K, using a low temperature STM. The intrinsic superconducting density of states (DOS) was obtained in the tunneling spectra exhibiting the BCS-shaped characteristic with a metallic background. A double-gap structure, with the gap values of ΔL=9.5 meV and ΔS=4.0 meV, was clearly observed in the local tunneling spectra. The result supports the multiple-gap model in MgB2 in the clean limit. The proximity effect was observed in the present conductance spectra and experimentally confirmed to be due to the Ar+ ion sputtering. The origin of the varied energy gap values reported in surface-sensitive STS measurements on MgB2 was also discussed in detail.

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Xu, M., Xiao, Z., Takano, Y., Hatano, T., & Fujita, D. (2004). Low temperature STM/STS studies on MgB2. Physica C: Superconductivity, 412414, P, 283–287. https://doi.org/10.1016/j.physc.2004.01.052

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