First principles investigation of the electronic structures of copper oxide superconductors by the MCSCF cluster method

Mikio Eto, Hiroshi Kamimura

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Electronic structures of LaSr-Cu-O and Nd-Ce-CuO compounds are investigated from first principles, taking CuO6, CuO4, Cu 2O11 and Cu2O7 clusters, as a model. Many-body states are calculated in the presence of the correlation effect by the MCSCF-CI variational method. In the hole-doped CuO6 cluster we have shown that the ground state changes from 1A1g to 3B1g near the doping concentration of the onset of superconductivity, owing to the effect of the apical oxygens. While in the electron- doped CuO4 cluster the ground state is always 3B8, in which the dopant electron is accommodated in the Cu 4s orbital. The effects of the doped ions are also discussed. In the undoped Cu2O11 and Cu2O7 clusters two electrons are localized at Cu sites, reflecting the strong correlation effect, and are coupled antiferromagnetically. The destruction mechanism of the antiferromagnetic ordering is shown to be different between in the hole-doped Cu2O11 and in the electron-doped Cu2O7 clusters.

Original languageEnglish
Pages (from-to)2311-2323
Number of pages13
JournalJournal of the Physical Society of Japan
Volume60
Issue number7
Publication statusPublished - 1991 Jul
Externally publishedYes

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copper oxides
electronic structure
electrons
ground state
destruction
superconductivity
orbitals
oxygen
ions

Keywords

  • CI
  • Cluster calculation
  • High temperature superconductors
  • MCSCF
  • Spin polaron mechanism

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

First principles investigation of the electronic structures of copper oxide superconductors by the MCSCF cluster method. / Eto, Mikio; Kamimura, Hiroshi.

In: Journal of the Physical Society of Japan, Vol. 60, No. 7, 07.1991, p. 2311-2323.

Research output: Contribution to journalArticle

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AB - Electronic structures of LaSr-Cu-O and Nd-Ce-CuO compounds are investigated from first principles, taking CuO6, CuO4, Cu 2O11 and Cu2O7 clusters, as a model. Many-body states are calculated in the presence of the correlation effect by the MCSCF-CI variational method. In the hole-doped CuO6 cluster we have shown that the ground state changes from 1A1g to 3B1g near the doping concentration of the onset of superconductivity, owing to the effect of the apical oxygens. While in the electron- doped CuO4 cluster the ground state is always 3B8, in which the dopant electron is accommodated in the Cu 4s orbital. The effects of the doped ions are also discussed. In the undoped Cu2O11 and Cu2O7 clusters two electrons are localized at Cu sites, reflecting the strong correlation effect, and are coupled antiferromagnetically. The destruction mechanism of the antiferromagnetic ordering is shown to be different between in the hole-doped Cu2O11 and in the electron-doped Cu2O7 clusters.

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