Abstract
Positron lifetimes in Bi 2Sr 2Ca ( n−1) Cu n O (2 n+4+ δ) or Bi-22( n−1) n superconducting compounds for n=1, 2 and 3 have been determined from positron annihilation lifetime (PAL) spectroscopy of associated γ-radiations. Bulk lifetime is shown to increase systematically with increase of n, the number of CuO 2-layers in the Bi-22( n−1) n compound. Positron annihilation probing of structural units of this perovskite-like crystal system has thus been demonstrated.
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