Abstract
The heat capacity of the single crystalline electride of with was larger than that of electron-undoped C12A7 in the temperature range , reflecting the metallic nature of the electride. A superconducting transition was detected as a heat capacity jump , and the profile and magnitude of agreed well with those expected from the BCS theory. The electron-phonon coupling constant and Debye temperature were much larger than those for alkali metals having -like conduction electrons as in the present electride, suggesting that electrides having a rigid structure will be a class of BCS superconductors.
- Received 10 October 2007
DOI:https://doi.org/10.1103/PhysRevB.77.092505
©2008 American Physical Society