Vortex state in YBa2Cu3Oy crystals: Vortex phase diagram and tunneling spectroscopy in magnetic field

N. Kobayashi, T. Nishizaki, K. Shibata, T. Sasaki

研究成果: Conference article査読

1 被引用数 (Scopus)


The vortex phase diagram of high-Tc superconductor YBa 2Cu3Oy (YBCO) single crystals has been studied by resistivity and magnetization measurements in magnetic fields up to 30 T. The vortex matter in YBCO shows a complex and rich phase diagram being affected by small change of oxygen content. Furthermore, the low-temperature scanning tunneling microscopy of slightly overdoped YBCO crystals in magnetic fields up to 5 T has been performed. We find that the vortex image at 4.2 K and 1 T forms a distorted triangular pattern with a hexagonal symmetry, but at 5 T it shows a disordered pattern indicating the vortex glass phase. These results are consistent with the vortex phase diagram resulted from macroscopic properties.

ジャーナルPhysica B: Condensed Matter
出版ステータスPublished - 2004 4 30
イベントProceedings of the 7th International Symposium on Research - Toulouse, France
継続期間: 2003 7 202003 7 23

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学


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