Two-photon momentum density in La2-xSrxCuO4 and Nd2-xCexCuO4

P. Blandin*, S. Massidda, B. Barbiellini, T. Jarlborg, P. Lerch, A. A. Manuel, L. Hoffmann, M. Gauthier, W. Sadowski, E. Walker, M. Peter, Jaejun Yu, A. J. Freeman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We present calculations of the electron-positron momentum density for the high-Tc superconductors La2-xSrxCuO4 and Nd2-xCexCuO4, together with experimental two-dimensional angular correlation of annihilation radiation (2D-ACAR) for Nd2-xCexCuO4. The calculations are based on first-principles electronic structure obtained using the full-potential linearized augmented-plane-wave and the linear muffin-tin orbital methods. Our results indicate a non-negligible overlap of the positron wave function with the CuO2 plane electrons responsible for the Fermi surfaces in these compounds. Therefore, these compounds may be well suited for investigating Fermi-surface-related effects. After the folding of umklapp terms according to Lock, Crisp, and West, the predicted Fermi-surface breaks are mixed with strong effects induced by the positron wave function in La2-xSrxCuO4, while their resolution is better in Nd2-xCexCuO4. A comparison of our calculations with the most recent experimental results for La2-xSrxCuO4 shows good agreement. For Nd2-xCexCuO4 good agreement is observed between theoretical and experimental 2D-ACAR profiles.

Original languageEnglish (US)
Pages (from-to)390-397
Number of pages8
JournalPhysical Review B
Volume46
Issue number1
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • Condensed Matter Physics

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