Ac inductive measurement of intergrain and intragrain currents in high-tc oxide superconductors

Baorong Ni; Toshiyuki Munakata; Teruo Matsushita; Masataka Iwakuma; Kazuo Funaki; Masakatsu Takeo; Kaoru Yamafuji

doi:10.1143/JJAP.27.1658

Ac inductive measurement of intergrain and intragrain currents in high-t_c oxide superconductors

Baorong Ni, Toshiyuki Munakata, Teruo Matsushita, Masataka Iwakuma, Kazuo Funaki, Masakatsu Takeo, Kaoru Yamafuji

Applied Energy Engineering

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

51 Citations (Scopus)

Abstract

Bulk intergrain current and closed intragrain current in sintered Y-Ba-Cu-O superconductors were measured at 77 K by using an ac inductive method. These currents can be separated because of the large difference in penetrating rates of the magnetic flux into specimens with respect to the ac field amplitude. The obtained intergrain current density agreed approximately with critical current density measured resistively. The closed intragrain current density amounted to 4.3×10⁸ A/m² at B=0.5 T and decreased gradually with increasing magnetic field. The present results show that the ac inductive measurement is one of the available nondestructive methods to characterize sintered oxide specimens.

Original language	English
Pages (from-to)	1658-1662
Number of pages	5
Journal	Japanese journal of applied physics
Volume	27
Issue number	9 R
DOIs	https://doi.org/10.1143/JJAP.27.1658
Publication status	Published - Sept 1988

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

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abstract = "Bulk intergrain current and closed intragrain current in sintered Y-Ba-Cu-O superconductors were measured at 77 K by using an ac inductive method. These currents can be separated because of the large difference in penetrating rates of the magnetic flux into specimens with respect to the ac field amplitude. The obtained intergrain current density agreed approximately with critical current density measured resistively. The closed intragrain current density amounted to 4.3×108 A/m2 at B=0.5 T and decreased gradually with increasing magnetic field. The present results show that the ac inductive measurement is one of the available nondestructive methods to characterize sintered oxide specimens.",

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AU - Ni, Baorong

AU - Munakata, Toshiyuki

AU - Matsushita, Teruo

AU - Iwakuma, Masataka

AU - Funaki, Kazuo

AU - Takeo, Masakatsu

AU - Yamafuji, Kaoru

PY - 1988/9

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N2 - Bulk intergrain current and closed intragrain current in sintered Y-Ba-Cu-O superconductors were measured at 77 K by using an ac inductive method. These currents can be separated because of the large difference in penetrating rates of the magnetic flux into specimens with respect to the ac field amplitude. The obtained intergrain current density agreed approximately with critical current density measured resistively. The closed intragrain current density amounted to 4.3×108 A/m2 at B=0.5 T and decreased gradually with increasing magnetic field. The present results show that the ac inductive measurement is one of the available nondestructive methods to characterize sintered oxide specimens.

AB - Bulk intergrain current and closed intragrain current in sintered Y-Ba-Cu-O superconductors were measured at 77 K by using an ac inductive method. These currents can be separated because of the large difference in penetrating rates of the magnetic flux into specimens with respect to the ac field amplitude. The obtained intergrain current density agreed approximately with critical current density measured resistively. The closed intragrain current density amounted to 4.3×108 A/m2 at B=0.5 T and decreased gradually with increasing magnetic field. The present results show that the ac inductive measurement is one of the available nondestructive methods to characterize sintered oxide specimens.

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Ac inductive measurement of intergrain and intragrain currents in high-t_c oxide superconductors

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