期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 125, 期 1, 页码 -出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-018-2316-8
关键词
-
资金
- Ministry of Higher Education of Malaysia [FRGS/1/2017/STG02/UKM/01/1]
The effects of rare-earth elements M=Er, Gd and La, and alkali metals M=Na, K and Rb substitution on (Tl0.7M0.3)Sr2CaCu2O7 (Tl-1212) are reported. The rare-earth elements were chosen by considering the ionic radius, i.e., from the smallest (Er+3) to the largest (La+3) ion. The samples were prepared via the solid-state reaction method. X-ray diffraction patterns showed the presence of major Tl-1212 and minor Tl-1201 and Ca0.3Sr0.7CuO2 phase in almost all samples. The resistance versus temperature curves for the rare-earth-substituted samples showed onset temperature between 87 and 90K and zero resistance temperature between 69 and 81K. Alkali metal substitutions exhibited Tl-1212 phase but showed no superconducting transition although the electrical resistivity was much lower than the rare-earth-substituted samples. AC susceptibility measurement showed superconducting transition T-c, between 59 and 80K for the rare-earth element-substituted samples. The average grain size, the transition temperature, T-c and the peak temperature T-p of the imaginary part of the susceptibility decreased as the ionic radius of the rare earths was reduced.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据