LOCAL ELECTRON-DENSITY AND VACANCY PROPERTIES FOR YBA2CU3-XSNXOY (X = 0-1.5) - A POSITRON-LIFETIME STUDY

被引：19
|
作者：
ZHANG, JC
CAO, SX
LIU, FQ
LIU, JZ
机构：
[1] HENAN NORMAL UNIV,DEPT PHYS,XINXIANG 453002,PEOPLES R CHINA
[2] HENAN NORMAL UNIV,CTR ANAL & TEST,XINXIANG 453002,PEOPLES R CHINA
来源：
PHYSICAL REVIEW B | 1993年 / 48卷 / 22期
关键词：
D O I：
10.1103/PhysRevB.48.16830
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, we report positron lifetimes for YBa2Cu3-xSnxOy (x = 0-1.5). From these results, we calculate the local electron density n, and vacancy concentration C(V) as a function of Sn content. The results show a significant Sn-substitution dependence. At low x (less-than-or-equal-to 0.4), n(e) decreases as x increases while at high x (greater-than-or-equal-to 0.8) it reaches a constant value. For C(V), a large change occurs at x between 0.8 and 1.0 and corresponds to the known O-T phase transition. Positron experiments show that the structure of the Y 1:2:3 oxygen-deficient system is orthorhombic.
引用
收藏
页码：16830 / 16832
页数：3
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