Abstract
Scanning tunneling microscopy and spectroscopy (STM/STS) experiments on a high-density sintered MgB 2 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 Δ L=9.5 meV and Δ S=4.0 meV, was clearly observed in the local tunneling spectra. These values give a BCS ratio (2 Δ/ k B T C) of 5.6 and 2.4, respectively, well above and well below the BCS limit. The result supports the multiple-gap model in MgB 2 in the clean limit. The proximity effect observed in the conductance spectra and the origin of the varied reported energy gap values of MgB 2 were also discussed in this study.
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