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Low temperature STM/STS studies on MgB2

✍ Scribed by M. Xu; Z. Xiao; Y. Takano; T. Hatano; D. Fujita

Publisher: Elsevier Science
Year: 2004
Tongue: English
Weight: 350 KB
Volume: 412-414
Category: Article
ISSN: 0921-4534
DOI: 10.1016/j.physc.2004.01.052

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✦ Synopsis

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 D L ¼ 9:5 meV and D S ¼ 4:0 meV, was clearly observed in the local tunneling spectra. The result supports the multiple-gap model in MgB 2 in the clean limit. The proximity effect was observed in the present conductance spectra and experimentally confirmed to be due to the Ar þ ion sputtering. The origin of the varied energy gap values reported in surface-sensitive STS measurements on MgB 2 was also discussed in detail.

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