Anisotropy of electron momentum distribution in Bi2Sr2CaCu2O(8+d) superconductor studied by positron annihilation technique
Abstract
The temperature dependent (30 K to 300 K) Doppler broadening of the positron annihilated g-radiation (DBPAR) measurement has been carried out on single crystalline Bi-2212 high Tc 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 to 116 K.
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