a.c. magnetization characteristics of Nd123 bulk superconductors

K. Waki, T. Higuchi, S. I. Yoo, M. Watahiki, N. Hayashi, N. Sakai, N. Chikumoto, M. Murakami

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Abstract

The a.c. magnetization characteristics of NdBa2Cu3Oy (Nd123) bulk superconductors were investigated using a.c. susceptometry. For the present study, an OCMG-processed Nd123 bulk sample (OCMG-Nd123; Tc = 93.9 K) and a flux-grown Nd123 single crystal (Nd123SC; Tc = 93.2 K) were used. An MPMG-processed Y123 bulk sample (MPMG-Y123; Tc = 91.6 K) was also studied for comparison. While the fundamental responses are basically the same for all samples, the third harmonic responses by sweeping the bias field, X3(Hdc), show an interesting feature in that the X3(Hdc) curves for Nd123 samples indirectly reflect the fishtail peak of their d.c. magnetization hysteresis (M-H) curves. The boundary lines of Nd123 samples, determined from both the peak temperature (Tp) of the X1″(T) maxima and the offset of the X3(Hdc), are commonly located at higher field-temperature region relative to that of the Y123. Using the scaling relationship of H∝(1 - t)n, where t = T/Tc, all the boundary lines from the X3(Hdc) and the X1″(T) maxima could be best fit with a power n of ∼ 1.2 and ∼ 1.4, respectively.

Original languageEnglish
Pages (from-to)643-647
Number of pages5
JournalCryogenics
Volume37
Issue number10
DOIs
Publication statusPublished - 1997 Oct

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Keywords

  • Critical current density
  • Irreversibility
  • Nd123 superconductors
  • Third harmonic response
  • a.c. susceptibility

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Waki, K., Higuchi, T., Yoo, S. I., Watahiki, M., Hayashi, N., Sakai, N., Chikumoto, N., & Murakami, M. (1997). a.c. magnetization characteristics of Nd123 bulk superconductors. Cryogenics, 37(10), 643-647. https://doi.org/10.1016/S0011-2275(97)00063-5