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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

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
Pages (from-to)390-397
Number of pages8
JournalPhysical Review B
Volume46
Issue number1
DOIs
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Condensed Matter Physics

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