Studies of coincidence Doppler broadening of the electron-positron annihilation radiation in the single crystalline Bi2Sr2CaCu2O8+δ superconductor

被引：11
|
作者：
Chakrabarti, M
Sarkar, A
Sanyal, D
Karwasz, GP
Zecca, A
机构：
[1] Variable Energy Cyclotron Ctr, Kolkata 700064, W Bengal, India
[2] Univ Calcutta, Dept Phys, Kolkata 700009, W Bengal, India
[3] Bangabasi Morning Coll, Dept Phys, Kolkata 700009, W Bengal, India
[4] Univ Trent, Dipartimento Fis, Ist Nazl Fis Mat, I-38050 Trento, Italy
来源：
PHYSICS LETTERS A | 2004年 / 321卷 / 5-6期
关键词：
Bi-based cuprate superconductors; positron annihilation technique;
D O I：
10.1016/j.physleta.2003.11.062
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Background suppressed Doppler broadening spectroscopy using a two detector coincidence technique of the electron-positron annihilation gamma-radiation has been employed on single crystalline Bi2Sr2CaCu2O8+delta high T-c superconductor. The spectra at different sample temperatures have been compared with the room temperature spectrum by constructing ratio-curve. The results indicate an effective shift of oxygen ions towards the Bi-O plane from the Cu-O plane just above the superconducting transition temperature. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：376 / 380
页数：5
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