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摘要: 在3~20 GPa压力范围内,测量了含氧量较低的YBa2Cu3O7-(=0.46)单晶压力增强效应(dTc/dp=4.9KGPa-1);YBa2Cu3O7(Tc0=90 K)单晶在压力下临界电流密度随压力变化;外磁场H=30 kOe时,Tc与磁场、压力关系;压力达16.5 GPa下,Bi2Sr2CaCu2Ox单晶Tc(p)关系(dTc/dp=-0.4 KGPa-1)。发现Y系高温超导体的温度压力导数dTc/dp与Tc0中间呈dTc/dp=b-mTc0线性关系(b、m为常数)。结合压力下Y系超导体结构相变和含氧量对Tc影响,分析这类超导体Tc有很强的正压力效应的原因。把实验结果同几种超导电性微观理论模型进行了分析和比较。
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关键词:
- YBa2Cu3O7- /
- Bi2Sr2CaCu2Ox /
- 高Tc超导体 /
- 高压
Abstract: The pressure dependence of the superconducting transition temperatures Tc, of single crystal YBa2Cu3O7- (=0.46) and Bi2Sr2CaCu2Ox were measured. The pressure derivatives, dTc/dp, were determined to be 4.9 KGPa-1 for YBa2Cu3O7- (=0.46) and -0.4 KGPa-1 for Bi2Sr2CaCu2Ox. Such a large change in Tc with increasing pressure was never observed before in Y123 specimens with a Tc0 of about 47 K at p=0. The dTc/dp is a function of Tc0, which can be written as dTc/dp=b-mTc0 (b and m are constants). The results are explained via the pressure induced structure phase transition in Y123, the influence of the oxygen vacancies on the Tc.-
Key words:
- YBa2Cu3O7- /
- Bi2Sr2CaCu2Ox /
- high-Tc /
- superconductors
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