Abstract
Scanning tunneling microscopy and spectroscopy (STM/STS) experiments on a high-density sintered MgB{sub 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 {delta}{sub L}=9.5 meV and {delta}{sub S}=4.0 meV, was clearly observed in the local tunneling spectra. The result supports the multiple-gap model in MgB{sub 2} in the clean limit. The proximity effect was observed in the present conductance spectra and experimentally confirmed to be due to the Ar{sup +} ion sputtering. The origin of the varied energy gap values reported in surface-sensitive STS measurements on MgB{sub 2} was also discussed in detail.
Citation Formats
Xu, M, Xiao, Z, Takano, Y, Hatano, T, and Fujita, D.
Low temperature STM/STS studies on MgB{sub 2}.
Netherlands: N. p.,
2004.
Web.
doi:10.1016/j.physc.2004.01.052.
Xu, M, Xiao, Z, Takano, Y, Hatano, T, & Fujita, D.
Low temperature STM/STS studies on MgB{sub 2}.
Netherlands.
https://doi.org/10.1016/j.physc.2004.01.052
Xu, M, Xiao, Z, Takano, Y, Hatano, T, and Fujita, D.
2004.
"Low temperature STM/STS studies on MgB{sub 2}."
Netherlands.
https://doi.org/10.1016/j.physc.2004.01.052.
@misc{etde_20618670,
title = {Low temperature STM/STS studies on MgB{sub 2}}
author = {Xu, M, Xiao, Z, Takano, Y, Hatano, T, and Fujita, D}
abstractNote = {Scanning tunneling microscopy and spectroscopy (STM/STS) experiments on a high-density sintered MgB{sub 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 {delta}{sub L}=9.5 meV and {delta}{sub S}=4.0 meV, was clearly observed in the local tunneling spectra. The result supports the multiple-gap model in MgB{sub 2} in the clean limit. The proximity effect was observed in the present conductance spectra and experimentally confirmed to be due to the Ar{sup +} ion sputtering. The origin of the varied energy gap values reported in surface-sensitive STS measurements on MgB{sub 2} was also discussed in detail.}
doi = {10.1016/j.physc.2004.01.052}
journal = []
issue = {1-2}
volume = {412-414}
journal type = {AC}
place = {Netherlands}
year = {2004}
month = {Oct}
}
title = {Low temperature STM/STS studies on MgB{sub 2}}
author = {Xu, M, Xiao, Z, Takano, Y, Hatano, T, and Fujita, D}
abstractNote = {Scanning tunneling microscopy and spectroscopy (STM/STS) experiments on a high-density sintered MgB{sub 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 {delta}{sub L}=9.5 meV and {delta}{sub S}=4.0 meV, was clearly observed in the local tunneling spectra. The result supports the multiple-gap model in MgB{sub 2} in the clean limit. The proximity effect was observed in the present conductance spectra and experimentally confirmed to be due to the Ar{sup +} ion sputtering. The origin of the varied energy gap values reported in surface-sensitive STS measurements on MgB{sub 2} was also discussed in detail.}
doi = {10.1016/j.physc.2004.01.052}
journal = []
issue = {1-2}
volume = {412-414}
journal type = {AC}
place = {Netherlands}
year = {2004}
month = {Oct}
}