STM spectroscopy on Ba₈Si₄₆

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• 作者：Ichimura ; Koichi ; Nomura ; Kazushige ; Fukuoka ; Hiroshi ; Yamanaka ; Shoji
• 关键词：Superconductivity ; Silicon clathrate ; STM ; Electron tunneling
• 刊名：Physica C
• 出版年：2003
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：May, 2003
• 卷：388-389
• 期：Complete
• 页码：577-578
• 文件大小：239 K

摘要

Superconducting phase of silicon clathrate Ba₈Si₄₆ was studied by the tunneling spectroscopy using STM. The energy gap structure associated with the superconducting state was observed clearly. The functional form of the tunneling spectra is explained by the model, in which the gap is assumed to be finite and has an anisotropy. According to the model, in which the gap varies depending on the direction in k-space, we obtain gap parameters as Δ_min