Positron annihilation study of La2-xMxCuO4（M=Sr, Ba） system

LU Qingfeng DU Baoli LI Xigui

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Positron annihilation study of La_2-xM_xCuO₄（M=Sr, Ba） system

更新时间：2021-03-12

- Positron annihilation study of La_2-xM_xCuO₄（M=Sr, Ba） system
- NUCLEAR TECHNIQUES Issue 8, (2004)
- 作者机构：
  
  1. 河南师范大学物理与信息工程学院
  2. 河南师范大学物理与信息工程学院,新乡,453007
- 作者简介：
- 基金信息：
  
  河南省自然科学基础研究项目(0111050700);河南省教委自然科学基金(2003140029)资助
- DOI：
  CLC： O572.11
- Published：01 August 2004
- 稿件说明：
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[1]路庆凤,杜保立,李喜贵.La_(2-x)M_xCuO_4(M=Sr,Ba)体系的正电子湮没研究[J].核技术,2004(08):594-597.

LU Qingfeng DU Baoli LI Xigui. Positron annihilation study of La_2-xM_xCuO₄（M=Sr, Ba） system[J]. Nuclear techniques, 2004, (8): 594-597.
[1]路庆凤,杜保立,李喜贵.La_(2-x)M_xCuO_4(M=Sr,Ba)体系的正电子湮没研究[J].核技术,2004(08):594-597. DOI：

LU Qingfeng DU Baoli LI Xigui. Positron annihilation study of La_2-xM_xCuO₄（M=Sr, Ba） system[J]. Nuclear techniques, 2004, (8): 594-597. DOI：

摘要

为了研究镧系超导体在掺杂为1/8时的超导转变温度反常抑制问题

我们对La2-xMxCuO4（LMCO

M=Sr

x=0.05

0.10

0.125

0.15

0.2）体系的室温正电子寿命谱进行了系统的测量。观察到了存在于x=0.125附近的电子密度（ne）的峰值响应

并讨论了相应的正电子湮没机制以及和超导电性之间的关系。

Abstract

The positron lifetime spectra of La2-xMxCuO4 (LMCO

M=Sr

x=0.05

0.10

0.125

0.15

0.2) were measured at room temperature for studying the long-standing mystery of "1/8 abnormal" in doped lanthanum cuprate. Electron density ne and void concentration (number density) CV were calculated as a function of substitution content x. The appearance of peak (ne) and valley (Cv) at x=0.125 and the correlation with superconductivity were discussed.

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