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首页> 外文期刊>Journal of Materials Research >Effect of nano-sized Sm_2BaCuO_5 particles addition on the pinning mechanism of Sm-Ba-Cu-O materials
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Effect of nano-sized Sm_2BaCuO_5 particles addition on the pinning mechanism of Sm-Ba-Cu-O materials

机译：纳米Sm_2BaCuO_5颗粒的添加对Sm-Ba-Cu-O材料钉扎机理的影响

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摘要

The superconducting properties of air-processed melt-textured growth Sm-Ba-Cu-O samples with addition of small amounts (0.004 wt percent, 0.4 wt percent, 4 wt percent) of nano-sized Sm_2BaCuO_5 particles (nm211) were studied. The microstructure observations show that the size distribution and morphology of the 211-particles of the nm211 -doped samples are similar to that of the control (undoped) samples. However, except for the 4 wt percent nm211-doped sample, both T_c (critical temperature) and J_c (H, T) (critical current density) are enhanced in nm211-doped samples, and the J_c-H curves are different from those of control samples. The effect of nm211 particles on J_c enhancement is larger at high magnetic fields (>1 T at 77 K) than at low magnetic fields (0 approx 1 T). The dominant pinning mechanism by analyzing the J_c (H, T) data using the scaling theory indicate that the nm211-doped samples are originated from DELTA kappa pinning (i.e., T_c variation); on the other hand, the control samples are originated from normal pinning (i.e., nonsuperconducting crystalline defects). It is proposed that nano-sized compositional fluctuations in the RE_(1+x)Ba_(2-x)Cu_3O_y matrix, which are products of nm211 particles and liquid peritectic reaction, act as the source of DELTA kappa pinning centers.
机译：研究了添加少量（0.004 wt％，0.4 wt％，4 wt％）纳米级Sm_2BaCuO_5颗粒（nm211）的空气处理的熔融织构生长Sm-Ba-Cu-O样品的超导性能。微观结构观察表明，掺杂nm211的样品的211个颗粒的尺寸分布和形态与对照（未掺杂）的样品相似。但是，除了掺杂了4wt％的nm211的样品外，在掺杂nm211的样品中T_c（临界温度）和J_c（临界电流密度）都得到了增强，并且J_c-H曲线与对照样品。 nm211粒子对J_c增强的影响在高磁场（77 K下> 1 T）下比在低磁场（0约1 T）下更大。通过使用定标理论分析J_c（H，T）数据的主要钉扎机制表明，掺杂nm211的样本源自DELTA kappa钉扎（即T_c变化）;另一方面，对照样品源自正常钉扎（即，非超导晶体缺陷）。有人提出，纳米粒子组成的RE_（1 + x）Ba_（2-x）Cu_3O_y基体中的纳米级成分涨落是液相DELTEC kappa钉扎中心的来源。

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  • 来源
    《Journal of Materials Research》 |2004年第3期|p.843-850|共8页
  • 作者

    Shih-Yun Chen; Ping-Chi Hseih; In-Gann Chen;

  • 作者单位

    Department of Materials Science and Engineering, National Cheng-Kung University, 701 Tainan, Taiwan, Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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