摘要
高压研究对于提高超导转变温度和探索高温超导机制是一种非常重要的手段。环境压力下Ｔ１－１２２３相单晶样品和Ｔ１－１２２３相和Ｔ１－１２１２相交生样品的抗磁起始转变温度分别为１０２Ｋ和１１６Ｋ。高压研究表明Ｔ１－１２２３相单晶样品的压力系数为ｄＴｃ／ｄＰ＝２．５Ｋ／ＧＰａ，当压力达６．４ＧＰａ时，ＴＣ达到最大值１１６Ｋ，比环境压力下升高了１４Ｋ。Ｔ１－１２２３相和Ｔ１－１２１２相交生样品的压力系数为ｄＴｃ／ｄＰ＝２．０Ｋ／ＧＰａ，当压力达５．３ＧＰａ时，ＴＣ达到最大值１２１Ｋ。结合高温超导体的结构特点分析了高压效应。
High pressure is an important method to search new superconductors and study the superconducting mechanism. At ambient temperature, the superconducting transition temperature of T1-1223 phase single crystal and the crystal mixed by T1-1223 and T1-1212 phase were 102K and 114K respectively. The high pressure study performed with quasihydrostatic pressure technique showed that T1-1223 phase single crystal whose pressure effect dTc/dP was 2.5K/GPa had a TC maximum value 116K at the pressure of 6.4GPa, the mixture phase sample of T1-1223 and T1-1212 with dTc/dP=2.0K/GPa had a TC maximum value 121K at the pressue of 5.3GPa. The higher superconducting transition temperature of these two samples was connected with their structures.
出处
《低温与超导》
CAS
CSCD
北大核心
1998年第2期32-36,共5页
Cryogenics and Superconductivity
关键词
铊系超导体
超导体
高TC
压力效应
Thallium superconductor, Carrier density, Copper oxide plane layer
