Quantum Limiting Behaviors of a Vortex Core in an Anisotropic Gap Superconductor
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概要
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Quantized bound states at a vortex core are discretized in YNi2B2C. By using scanning tunneling spectroscopy with an unprecedented 0.1 nm spatial resolution, we find and identify the localized spectral structure, where in addition to the first main peak with a positive low energy, a second subpeak coming from the fourfold symmetric gap structure is seen inside the energy gap. Those spectral features are understood solving the Bogoliubov--de Gennes equation for a fully three-dimensional gap structure. A particle--hole asymmetric spectrum at the core site and quantum oscillation in the spectra are clearly observed.
- 2012-06-15
著者
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Machida Kazushige
Department Of Physics Kyoto University
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Hirata Kazuto
National Institute For Material Science
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Takeya Hiroyuki
National Institute For Material Science
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Nishida Nobuhiko
Department Of Physics Faculty Of Science Tokyo Institute Of Technology
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Matsuba Ken
Department Of Physics Tokyo Institute Of Technology
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Kaneko Shin-ichi
Department Of Physics Faculty Of Science Hiroshima University
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Mizushima Takeshi
Department Of Physics Okayama University
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Kakizaki Erika
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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Matsuba Ken
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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Nishida Nobuhiko
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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HAFIZ Muhammad
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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Yamasaki Keigo
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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Kawakami Takuto
Department of Physics, Okayama University, Okayama 700-8530, Japan
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Kaneko Shin-ichi
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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