Abstract
Doppler broadening of the electron positron annihilation γ-radiation spectra of single crystalline Bi 2Sr 2CaCu 2O 8+ δ high T c superconducting sample along the two different crystallographic orientations ( c-axis and a– b-plane) have been analyzed by constructing ratio-curves with the reference spectra of defect free 99.9999% pure Al and Cu, respectively. The results indicate that the momentum component ( p L) of the 2p electrons of oxygen ions and the 3d electrons of the Cu ions is relatively more towards the c-axis than the a– b-plane.
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