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Anisotropy of the electron momentum distribution in Bi2Sr2CaCu2O8+δ superconductor studied by positron annihilation |
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| Authors: | Mahuya ChakrabartiA. Sarkar S. ChattapadhayayD. Sanyal A.K. PradhanR. Bhattacharya D. Banerjee |
| Affiliation: | a Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata 700009, India b Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India c Department of Physics, University of Virginia, McCormick Road, Virginia 22901, USA d Department of Physics, Bangabasi Morning College, 19 Rajkumar Chakraborty Sarani, Kolkata 700 009, India |
| Abstract: | The temperature dependent (30-300 K) Doppler broadening of the positron annihilated γ-radiation measurement has been investigated on single crystalline Bi2Sr2CaCu2O8+δ (Bi-2212) high Tc superconducting samples along two different crystallographic orientations. It has been observed that throughout the temperature range the electron momentum distribution has a larger value along the crystallographic c-axis than in the a-b plane. The temperature dependent Doppler broadened positron annihilation γ-radiation lineshape analysis shows a step like increase of S-parameter at the temperature region 92-116 K. |
| Keywords: | 74.72.Hs 78.70.Bj |
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