Quantum Limiting Behaviors of a Vortex Core in an Anisotropic Gap Superconductor
2012; Physical Society of Japan; Volume: 81; Issue: 6 Linguagem: Inglês
10.1143/jpsj.81.063701
ISSN1347-4073
AutoresShin-ichi Kaneko, Ken Matsuba, Muhammad Hafiz, Keigo Yamasaki, Erika Kakizaki, Nobuhiko Nishida, Hiroyuki Takeya, K. Hirata, Takuto Kawakami, Takeshi Mizushima, Kazushige Machida,
Tópico(s)Rare-earth and actinide compounds
ResumoQuantized bound states at a vortex core are discretized in YNi 2 B 2 C. 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.
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