Electronic structure and Fermi surface topology of the infinite-layered superconductor Sr1-xCaxCuO2

D. L. Novikov, V. A. Gubanov, Arthur J Freeman

Research output: Contribution to journalArticle

38 Citations (Scopus)


Superconductivity reported at 110 K, and recently at 150-170 K, in the infinite-layered (SrxCa1-x)CuO2 system is investigated by means of the full potential linear muffin-tin orbital (FLMTO) method. As in other high-Tc cuprates, the electronic structure of the parent compounds, CaCuO2 and SrCuO2, and of the separately calculated composition Sr0.7Ca0.3CuO2 using the experimental lattice parameters, displays strong 2D features including a low density of states at EF (lower than in the other cuprates) and a simple 2D Fermi surface (rounded square) with strong nesting due to a single hybridized Cu d-O p band. As in La2CuO4, a major van Hove saddle-point singularity exists near EF. The drastic changes of the Fermi surface when Ca/Sr vacancies shift the Fermi energy to the van Hove singularity may have a strong influence on the superconducting properties of the compounds and indicate the need for Sr/Ca vacancies in inducing the high Tc.

Original languageEnglish
Pages (from-to)301-307
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Issue number3-4
Publication statusPublished - Jun 1 1993


ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this