Abstract
A high-density sintered MgB2 surface has been investigated at 4.2 K by low-temperature scanning tunneling microscopy and spectroscopy (LT-STM/STS). The intrinsic superconducting density of states (DOS) is determined in most typically found 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=4.5 meV, is identified in the intrinsic local conductance spectra. These values give a BCS ratio (2Δ/κBTC) of 5.6 and 2.6, i.e., respectively, well above and well below the BCS limit. Our results presented here support the multiple-gap model in MgB2 in the clean limit.
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