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

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

Research output: Contribution to journalConference articlepeer-review

1 Citation (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.

Original languageEnglish
Pages (from-to)329-333
Number of pages5
JournalPhysica B: Condensed Matter
Issue number1-4
Publication statusPublished - 2004 Apr 30
EventProceedings of the 7th International Symposium on Research - Toulouse, France
Duration: 2003 Jul 202003 Jul 23


  • High-T superconductor
  • Scanning tunneling microscopy
  • Vortex image
  • Vortex phase diagram

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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