Abstract
We have performed ultrahigh energy- and momentum-resolved angle-resolved photoemission spectroscopy of impurity-doped Bi2 Sr2 CaCu2 O8. We found that the point node of the superconducting gap near the (π/2,π/2) point in a pristine sample gradually evolves into a small gapless Fermi arc upon Zn or Ni doping. The shape of impurity-induced density of states inside the superconducting gap shows a marked difference between Zn and Ni doping, demonstrating that the low-energy excitation properties are strongly sensitive to the character of impurities.
Original language | English |
---|---|
Article number | 100502 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 78 |
Issue number | 10 |
DOIs | |
Publication status | Published - Sep 4 2008 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics