Electronic structure of Ca sub x C sub 60 fullerides

• Published in: Physical review. B, Condensed matter Vol. 46:12
• Main Authors: Chen, Y., Poirier, D.M., Jost, M.B., Gu, C., Ohno, T.R., Martins, J.L., Weaver, J.H., Chibante, L.P.F., Smalley, R.E.
• Format: Journal Article
• Language: English
• Published: United States 15-09-1992
• Subjects: ALKALINE EARTH METAL COMPOUNDS; CALCIUM CARBIDES; CALCIUM COMPOUNDS; CARBIDES; CARBON; CARBON COMPOUNDS; ELECTRIC CONDUCTIVITY; ELECTRICAL EQUIPMENT; ELECTRICAL INSULATORS; ELECTRICAL PROPERTIES; ELECTRONIC STRUCTURE; ELEMENTS; EMISSION; FULLERENES; MATERIALS SCIENCE; NONMETALS; PHOTOEMISSION; PHYSICAL PROPERTIES; QUANTITY RATIO; SECONDARY EMISSION 360204 > Ceramics, Cermets, & Refractories > Physical Properties; SOLID CLUSTERS; SUPERCONDUCTIVITY
• DOI: 10.1103/PhysRevB.46.7961
• EISSN: 1095-3795
• ISSN: 0163-1829

Photoemission and inverse photoemission studies of Ca{sub {ital x}}C{sub 60} films show insulating character for {ital x}{lt}3{plus minus}0.3 as states derived primarily from the LUMO orbitals of C{sub 60} are occupied. Metallic character is observed at higher Ca content as a second band of states is partially occupied. This band has mixed character since it is derived from the LUMO+1 orbitals of C{sub 60} and the Ca {ital s} states. These states are responsible for superconductivity in Ca{sub 5}C{sub 60}.