摘要
多晶样品Y(Ba1-xGdx)2Cu3O7-δ(YBGCO)(x=0.0,0.02,0.03,0.05,0.08,0.10)是由标准固相反应法制备获得。XRD的Rietveld精修显示,Gd成功地部分替代YBa2Cu3O7-δ(YBCO)晶胞中的Ba位。实验结果表明,对于某一固定磁场Y(Ba1-xGdx)2Cu3O7-δ的临界电流密度(Jc)在x=0.05有最大值。此外,尽管YBGCO的超导温度(Tc)明显地单调下降,但微量的Gd掺杂导致磁场中YBGCO的Jc的提高。Jc随着Gd掺杂量不同而变化的特征行为可以认为,是由Gd掺杂引起的两种不同的效果竞争共同作用造成的,即纳米尺度范围内空间分布不均匀性和超导性的变化。
The poly - crystallized samples of Y（Ba1-xGdx）2Cu3O7-δ with x = 0.0, 0.02, 0.03, 0.05, 0.08, 0.10, were prepared by standard solid state reactions method. X -ray diffraction with Rietveld refinement studies showed that Gd replaced partly Ba in the unit cell. The critical current density （Jc） exhibited a maximum at x = 0. 05 for Y（Ba1-xGdx）2Cu3O7-δ samples with fixing field. Moreover, slight Gd-doping in YBa2Cu307 - （YBCO）enhanced Jc by applying the magnetic field, although the superconducting temperature （Tc） decreased slightly. The characteristic behavior of Jc with varying the Gd content can be explained in terms of the competition between two different effects caused by Gd - doping in YBCO： the inhomogeneity of grains distribution in nanoscale and the variation of superconductivity.
出处
《低温与超导》
CAS
CSCD
北大核心
2010年第4期47-50,共4页
Cryogenics and Superconductivity
基金
江苏科技大学博士科研启动基金项目(35270802)资助
