摘要
品质优良的110K超导体(Bi,Pb)_2Sr_2Ca_2Cu_3O_y的单相多晶样品已制备,其零电阻温度为107K。讨论了2201相,2212相和2223相的形成和转变以及淬火温度对其的影响。测量了样品的复磁化率,结果表明超导体晶粒间的Josephson结的耦合强度与样品的制备过程有关,对不同热处理的样品测其比热;△c(107K)=5.3J/molK,索末菲常数v=34.6mJ/molK,比热跳跃与热处理过程有着强烈的关系,进行了电子衍射分析,测量了样品的氧含量,且讨论了氧含量对样品的超导体积含量的影响。
High-quality single phase polycrystalline sample of 110K superconductor (Bi,Pb)2Sr2Ca2-Cu3O_y was prepared, the temperature of zero resistance of which is 107K. In this paper, the formation and transformation of the 2201, 2212 and 2223 phase, and the influence of quenching temperature are discussed. The measurement of complex susceptibility shows the strength of Josephson coupling among the superconducting grains depends on the process of sample preparation. The specific heat jump is △c(107K) =5.3J/molK, and the Sommerfeld cntant is γ = 34.6mJ/molK. The specific heat jump is related to the heat treatment of samples strongly. The eletron diffraction analysis and measurement of the oxygen content of these samples are made. The relationship between the oxygen content and the superconducting volume fraction is also discussed.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第2期297-302,共6页
Acta Physica Sinica
基金
国家超导技术联合研究开发中心资助的课题
中国科学技术大学结构与成份分析中心开放实验室资助的课题
