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Effect of Nano-Sized Sm2BaCuO5 Particles Addition on the Pinning Mechanism of Sm–Ba–Cu–O Materials

Published online by Cambridge University Press:  03 March 2011

Shih-Yun Chen ,
Ping-Chi Hseih ,
In-Gann Chen  and
Mow-Kuen Wu
Shih-Yun Chen
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, 701 Tainan, Taiwan, Republic of China
Ping-Chi Hseih
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, 701 Tainan, Taiwan, Republic of China
In-Gann Chen*
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, 701 Tainan, Taiwan, Republic of China
Mow-Kuen Wu
Affiliation:
Institute of Physics, Academia Sinica, 115 Taipei, Taiwan, Republic of China
*
a)Address all correspondence to this author. e-mail: ingann@mail.ncku.edu.tw
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Abstract

The superconducting properties of air-processed melt-textured growth Sm–Ba–Cu–O samples with addition of small amounts (0.004 wt%, 0.4 wt%, 4 wt%) of nano-sized Sm2BaCuO5 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% nm211-doped sample, both Tc (critical temperature) and Jc (H, T) (critical current density) are enhanced in nm211-doped samples, and the Jc–H curves are different from those of control samples. The effect of nm211 particles on Jc enhancement is larger at high magnetic fields (>1 T at 77 K) than at low magnetic fields (0∼1 T). The dominant pinning mechanism by analyzing the Jc (H, T) data using the scaling theory indicate that the nm211-doped samples are originated from Δκ pinning (i.e., Tc 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 RE1+x Ba2−x Cu3O y matrix, which are products of nm211 particles and liquid peritectic reaction, act as the source of Δκ pinning centers.

Keywords

SuperconductorAdditivesNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 3 , March 2004 , pp. 843 - 850
Copyright
Copyright © Materials Research Society 2004

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