a.c. magnetization characteristics of Nd123 bulk superconductors

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

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
Publication statusPublished - 1997 Oct
Externally publishedYes

Fingerprint

Superconducting materials
Magnetization
magnetization
Hysteresis
Temperature distribution
Single crystals
Fluxes
curves
temperature distribution
Temperature
hysteresis
harmonics
scaling
single crystals
temperature

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Waki, K., Higuchi, T., Yoo, S. I., Watahiki, M., Hayashi, N., Sakai, N., ... Murakami, M. (1997). a.c. magnetization characteristics of Nd123 bulk superconductors. Cryogenics, 37(10), 643-647.

a.c. magnetization characteristics of Nd123 bulk superconductors. / Waki, K.; Higuchi, T.; Yoo, S. I.; Watahiki, M.; Hayashi, N.; Sakai, Naomichi; Chikumoto, N.; Murakami, Masato.

In: Cryogenics, Vol. 37, No. 10, 10.1997, p. 643-647.

Research output: Contribution to journalArticle

Waki, K, Higuchi, T, Yoo, SI, Watahiki, M, Hayashi, N, Sakai, N, Chikumoto, N & Murakami, M 1997, 'a.c. magnetization characteristics of Nd123 bulk superconductors', Cryogenics, vol. 37, no. 10, pp. 643-647.
Waki K, Higuchi T, Yoo SI, Watahiki M, Hayashi N, Sakai N et al. a.c. magnetization characteristics of Nd123 bulk superconductors. Cryogenics. 1997 Oct;37(10):643-647.
Waki, K. ; Higuchi, T. ; Yoo, S. I. ; Watahiki, M. ; Hayashi, N. ; Sakai, Naomichi ; Chikumoto, N. ; Murakami, Masato. / a.c. magnetization characteristics of Nd123 bulk superconductors. In: Cryogenics. 1997 ; Vol. 37, No. 10. pp. 643-647.
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