Effect of nonsuperconducting secondary inclusions on the magnetization relaxation in melt-processed RBa2Cu3O7-δ (R = Nd and Yb) bulk superconductors at high temperatures

T. Mochida, N. Chikumoto, Masato Murakami

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Abstract

We have studied the effect of nonsuperconducting inclusions on the magnetization relaxation in melt-processed RBa2Cu3O7-δ (R=Nd and Yb) bulk superconductor in a high - temperature region (77≤T ≤90 K). It is found that nonsuperconducting inclusions are mainly effective in reducing the normalized relaxation rate S (≡ -d ln M/d ln t) at low fields [birr(≡ μ0Ha/Birr)≲0.1] and at high fields (birr≳0.4). A suppression in S is observed in an intermediate field region (0.1≲birr≲0.4) for the samples exhibiting secondary peak effect, suggesting a relation between the peak and the suppression.

Original languageEnglish
Article number064518
Pages (from-to)645181-645187
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number6
Publication statusPublished - 2001 Aug 1
Externally publishedYes

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Superconducting materials
Magnetization
retarding
inclusions
magnetization
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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abstract = "We have studied the effect of nonsuperconducting inclusions on the magnetization relaxation in melt-processed RBa2Cu3O7-δ (R=Nd and Yb) bulk superconductor in a high - temperature region (77≤T ≤90 K). It is found that nonsuperconducting inclusions are mainly effective in reducing the normalized relaxation rate S (≡ -d ln M/d ln t) at low fields [birr(≡ μ0Ha/Birr)≲0.1] and at high fields (birr≳0.4). A suppression in S is observed in an intermediate field region (0.1≲birr≲0.4) for the samples exhibiting secondary peak effect, suggesting a relation between the peak and the suppression.",
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T1 - Effect of nonsuperconducting secondary inclusions on the magnetization relaxation in melt-processed RBa2Cu3O7-δ (R = Nd and Yb) bulk superconductors at high temperatures

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AU - Chikumoto, N.

AU - Murakami, Masato

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N2 - We have studied the effect of nonsuperconducting inclusions on the magnetization relaxation in melt-processed RBa2Cu3O7-δ (R=Nd and Yb) bulk superconductor in a high - temperature region (77≤T ≤90 K). It is found that nonsuperconducting inclusions are mainly effective in reducing the normalized relaxation rate S (≡ -d ln M/d ln t) at low fields [birr(≡ μ0Ha/Birr)≲0.1] and at high fields (birr≳0.4). A suppression in S is observed in an intermediate field region (0.1≲birr≲0.4) for the samples exhibiting secondary peak effect, suggesting a relation between the peak and the suppression.

AB - We have studied the effect of nonsuperconducting inclusions on the magnetization relaxation in melt-processed RBa2Cu3O7-δ (R=Nd and Yb) bulk superconductor in a high - temperature region (77≤T ≤90 K). It is found that nonsuperconducting inclusions are mainly effective in reducing the normalized relaxation rate S (≡ -d ln M/d ln t) at low fields [birr(≡ μ0Ha/Birr)≲0.1] and at high fields (birr≳0.4). A suppression in S is observed in an intermediate field region (0.1≲birr≲0.4) for the samples exhibiting secondary peak effect, suggesting a relation between the peak and the suppression.

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