Anisotropy of electron momentum distribution in Bi$_2$Sr$_2$CaCu$_2$O$_(8+d)$ superconductor studied by positron annihilation technique

Details Anisotropy of electron momentum distribution in Bi$_2$Sr$_2$CaCu$_2$O$_(8+d)$ superconductor studied by positron annihilation technique Anisotropy of electron momentum distribution in Bi$_2$Sr$_2$CaCu$_2$O$_(8+d)$ superconductor studied by positron annihilation technique

2003-07-30

arxiv.org/abs/cond-mat/0307725v1

Physics

Condensed Matter

Superconductivity

12 pages, 2 figures, Communicated to "Solid State Communications"

Scientific paper

10.1016/j.ssc.2003.07.007

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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