2013/07/12 by Shunsuke Yoshizawa, Taiji Koseki, Ken Matsuba +5
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.7566/jpsj.82.083706
published as J. Phys. Soc. Jpn. 82 (2013) 083706
openalex publication_date 2013/07/12 · arxiv created 2013/07/16 · arxiv updated 2013/07/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
We studied electronic states in vortex cores of slightly overdoped Bi2Sr2CaCu2Ox by scanning tunneling spectroscopy. We have found that they have stripe structures with a 4a0 width extending along the Cu-O bond directions. Vortex core states are observed as two peaks at particle-hole symmetric positions in the energy gap. Along a stripe, the peak positions of vortex core states are constant and not influenced by the spatial variation of the energy gap Δ. Outer stripes have a larger energy than inner stripes. A mazelike pattern in the electronic states at E = +-Δ has been observed all over the surface both inside and outside the vortex core. The orientation of stripes of vortex core states was found to be related to the mazelike pattern in the vortex core region. A short-range order of the mazelike pattern spatially coexists with the superconductivity and locally breaks the symmetry of the two Cu-O bond directions. We propose that the vortex core bound states are formed by Bogoliubov quasiparticles owing to the depairing of Cooper pairs and have a local C2 symmetry influenced by the short-range order of the mazelike pattern.