Metal–Metal Distances, Electron Counts, and Superconducting TC's in AM2B2C
✍ Scribed by Claudia Felser
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 340 KB
- Volume
- 160
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
We present 5rst principles band structure calculations on representative boron carbides belonging to the class of superconducting compounds with the general formula AM 2 B 2 C with A ؍ Lu, La, or Th and M ؍ Ni or Pd. The compounds are analyzed within the framework of the so-called van Hove scenario, where superconductivity is linked to certain kinds of instabilities in the band structure. We attempt to determine why the addition of the extra electron on replacing the rare earth with Th does not make a signi5cant di4erence to the superconducting properties, and why the compound LaNi 2 B 2 C is not superconducting.