Abstract
We have performed a high-resolution angle-resolved photoemission spectroscopy (ARPES) on high-Tc superconductors (HTSCs) Bi 2Sr2Can-1CunO2n+4 (n=1-3) to study the systematics of the electronic structure and the origin of many-body interactions responsible for superconductivity. We find that a large hole-like Fermi surface and d-wave superconducting gap are generic features of Bi-based HTSCs. For n=2 and 3, a sudden change in the energy dispersion, so-called "kink", becomes pronounced on approaching (π,0) in the superconducting state, while a kink appears only around the nodal direction in the normal state. The kink around (π,0) disappears at Tc. For n=1, the kink shows no significant temperature dependence even across Tc. This could suggest that the coupling of electrons with Q=(π,π) magnetic mode is dominant in the superconducting state for multi-layered cuprates, while the interaction at the normal state and that of single-layered cuprates have a different origin.
Original language | English |
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Pages (from-to) | 51-58 |
Number of pages | 8 |
Journal | Physica C: Superconductivity and its applications |
Volume | 412-414 |
Issue number | SPEC. ISS. |
DOIs | |
Publication status | Published - Oct 1 2004 |
Keywords
- ARPES
- Bi-based cuprates
- Electronic structure
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering