Local Density of Electronic States in MgB2 Studied by Scanning Tunneling Microscopy
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概要
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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 $\Delta_{L}=9.5$ meV and $\Delta_{S}=4.5$ meV, is identified in the intrinsic local conductance spectra. These values give a BCS ratio ($2\Delta/\kappa_{B}T_{C}$) 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.
- 2003-07-15
著者
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Takano Yoshihiko
Nanomaterials Laboratory National Institute For Materials Science
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Hatano Takeshi
Nanomaterials Laboratory National Institute For Materials Science
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Fujita Daisuke
Nanomaterials Laboratory National Institute For Materials Science
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Kitahara Masayo
Nanomaterials Laboratory National Institute For Materials Science
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Xu Mingxiang
Nanomaterials Laboratory National Institute For Materials Science
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Sagisaka Keisuke
Nanomaterials Laboratory National Institute For Materials Science
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Wang Zhijie
Department Of Mathematical Engineering And Information Physics Graduate School Of Engineering The Un
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Sagisaka Keisuke
Nanomaterials Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Xiao Zhanwen
Nanomaterials Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Wang Zhijie
Department of Electrical Engineering, Dong Hua University, Shanghai, 200051, People's Republic of China
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Xu Mingxiang
Nanomaterials Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Kitahara Masayo
Nanomaterials Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Hatano Takeshi
Nanomaterials Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Takano Yoshihiko
Nanomaterials Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Fujita Daisuke
Nanomaterials Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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