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Quantum-Dimensional Effects In The Positron Annihilation Spectra Of La–Ba–Cu–O Superconductors

  • A. A. Paiziev
Conference paper
Part of the NATO Science for Peace and Security Series B: Physics and Biophysics book series (NAPSB)

This paper is devoted to explain the anisotropy phenomena of angular distribution annihilation photons (ADAP) in mono-crystalline La—Ba—Cu—O high temperature superconductors (HTSC) with alternating conductive (Cu—O(1)) and nonconductive (La—O(2)) layers. It is shown that the basic contribution to the anisotropy of ADAP spectra is connected with positron annihilation in the conductive Cu—O(1) layers. To describe the behavior of conduction electrons in the Cu—O(1) layer, the 2D model of a free Fermi gas was used. In the transverse direction, electron states are described in model one-dimensional potential well. It is shown that in the transverse direction the ADAP spectra possess several “plateaus” corresponding to positions of allowed electron states, while in longitudinal direction the ADAP spectra posses a parabolic form.

Keywords

electron—positron annihilation anisotropy high-temperature superconductors quantum dimensional effects 

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Copyright information

© Springer Science + Business Media B.V 2009

Authors and Affiliations

  • A. A. Paiziev
    • 1
  1. 1.Positron Physics LaboratoryArifov Institute of Electronics Uzbek Academy of ScienceTashkentUzbekistan

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