Effects of carbon nanotube addition on superconductivity in Y-Ba-Cu-O bulk superconductors

Kazuo Inoue, Y. Miyake, Muralidhar Miryala, Masato Murakami

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Abstract

Bulk Y-Ba-Cu-O superconductors have significant potential for engineering applications due to high critical current density, which is attributed to the presence of pinning centers such as Y2BaCuO5. The introduction of nano-sized secondary phase is known to act as more effective pinning center than those in micron sizes. The diameter of carbon nanotube (CNT) is close to that of the coherence length of high-temperature superconductors, which is expected to improve the flux pinning performance. We have investigated the effects of CNT addition on the microstructure, superconducting transition temperature (Tc), and critical current density (Jc) of YBa2Cu3Ox (Y123) based bulk superconductors. SEM observation showed the distribution of needle-like particles around 100 nm in length in the Y123 matrix for the CNT added samples. The highly porous texture was also observed for the excess addition of CNT. Tc was enhanced from 90.5 K to 91.8 K with increasing CNT addition. It is probable that carbon originated from CNT suppressed oxidation and carrier doping. Jc exhibited the highest value for 0.25 wt% CNT added sample. This suggests that nano-sized needle-like particles act as effective pinning centers. However, a further increase of CNT led to the decline of Jc, which suggests that there is an optimum amount of CNT for the improvement of Jc. The secondary peak was observed for the sample with 1 wt% CNT addition, where CO3 substitutions with Cu site at the Cu-O chain might induce oxygen vacancies leading to the field induced pinning.

Original languageEnglish
Article number012051
JournalJournal of Physics: Conference Series
Volume871
Issue number1
DOIs
Publication statusPublished - 2017 Jul 26

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superconductivity
carbon nanotubes
needles
critical current
current density
YBCO superconductors
flux pinning
high temperature superconductors
textures
transition temperature
engineering
substitutes
microstructure
oxidation
scanning electron microscopy
carbon
oxygen
matrices

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Effects of carbon nanotube addition on superconductivity in Y-Ba-Cu-O bulk superconductors. / Inoue, Kazuo; Miyake, Y.; Miryala, Muralidhar; Murakami, Masato.

In: Journal of Physics: Conference Series, Vol. 871, No. 1, 012051, 26.07.2017.

Research output: Contribution to journalArticle

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