Abstract
MgB2 shows the highest superconducting transition temperature among intermetallic compounds. Angle-resolved photoemission spectroscopy revealed their electronic structure, and the result is well explained within a simple band picture except for one band. Other photoemission studies on related materials of AlB2 and CaAlSi also show an extra band similar to that in MgB2. The direct observation of the superconducting gap confirmed a two-gap superconductivity. The larger and smaller gaps open at the σ and π bands, respectively. The carbon substitution effect on the two gaps was evaluated by using sub-meV photoemission spectroscopy.
Original language | English |
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Pages (from-to) | 126-133 |
Number of pages | 8 |
Journal | Physica C: Superconductivity and its applications |
Volume | 456 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - Jun 1 2007 |
Keywords
- Band structure
- Photoemission spectroscopy
- Superconducting gap
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering