The temperature dependent (30 K to 300 K) Doppler broadening of the positron annihilated γ-radiation (DBPAR) measurement has been carried out on single crystalline Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212) high T c superconducting sample along two different crystallographic orientations. It has been observed that throughout the temperature range the electron momentum distribution has a relatively large value along the crystallographic c-axis than a-b plane. The temperature dependent DBPARL analysis shows a step like increase of S-parameter at the temperature region 92 K to116 K.
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