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

doi:10.1016/S0011-2275(97)00063-5

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

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The a.c. magnetization characteristics of NdBa₂Cu₃O_y (Nd123) bulk superconductors were investigated using a.c. susceptometry. For the present study, an OCMG-processed Nd123 bulk sample (OCMG-Nd123; T_c = 93.9 K) and a flux-grown Nd123 single crystal (Nd123SC; T_c = 93.2 K) were used. An MPMG-processed Y123 bulk sample (MPMG-Y123; T_c = 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(H_dc), show an interesting feature in that the _X3(H_dc) 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 (T_p) of the _X1″(T) maxima and the offset of the _X3(H_dc), 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/T_c, all the boundary lines from the _X3(H_dc) and the _X1″(T) maxima could be best fit with a power n of ∼ 1.2 and ∼ 1.4, respectively.

Original language	English
Pages (from-to)	643-647
Number of pages	5
Journal	Cryogenics
Volume	37
Issue number	10
DOIs	https://doi.org/10.1016/S0011-2275(97)00063-5
Publication status	Published - 1997 Oct
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Materials Science(all)
Physics and Astronomy(all)

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10.1016/S0011-2275(97)00063-5

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@article{175babdbfba34d299e8628ef3537b60b,

title = "a.c. magnetization characteristics of Nd123 bulk superconductors",

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.",

keywords = "Critical current density, Irreversibility, Nd123 superconductors, Third harmonic response, a.c. susceptibility",

author = "K. Waki and T. Higuchi and Yoo, {S. I.} and M. Watahiki and N. Hayashi and N. Sakai and N. Chikumoto and M. Murakami",

year = "1997",

month = oct,

doi = "10.1016/S0011-2275(97)00063-5",

language = "English",

volume = "37",

pages = "643--647",

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T1 - a.c. magnetization characteristics of Nd123 bulk superconductors

AU - Waki, K.

AU - Higuchi, T.

AU - Yoo, S. I.

AU - Watahiki, M.

AU - Hayashi, N.

AU - Sakai, N.

AU - Chikumoto, N.

AU - Murakami, M.

PY - 1997/10

Y1 - 1997/10

N2 - 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.

AB - 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.

KW - Critical current density

KW - Irreversibility

KW - Nd123 superconductors

KW - Third harmonic response

KW - a.c. susceptibility

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EP - 647

JO - Cryogenics

JF - Cryogenics

IS - 10

ER -

a.c. magnetization characteristics of Nd123 bulk superconductors

Abstract

Keywords

ASJC Scopus subject areas

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