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

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

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Abstract

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
Volume210
Issue number3-4
DOIs
Publication statusPublished - Jun 1 1993

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Fermi surface
trucks
cuprates
Superconducting materials
Fermi surfaces
Vacancies
Electronic structure
topology
Topology
electronic structure
Tin
saddle points
Superconductivity
Fermi level
Lattice constants
lattice parameters
tin
superconductivity
orbitals
shift

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electronic structure and Fermi surface topology of the infinite-layered superconductor Sr1-xCaxCuO2. / Novikov, D. L.; Gubanov, V. A.; Freeman, Arthur J.

In: Physica C: Superconductivity and its Applications, Vol. 210, No. 3-4, 01.06.1993, p. 301-307.

Research output: Contribution to journalArticle

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