Effect of nonsuperconducting secondary inclusions on the magnetization relaxation in melt-processed RBa2Cu3O7−δ (R=Nd and Yb) bulk superconductors at high temperatures
Tadashi Mochida, Noriko Chikumoto, Masato Murakami
DOI 10.1103/PhysRevB.64.064518 · Physical Review B
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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 (≡−dlnM/dlnt) 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94.5 | Pressure unresolved | onset |
| YbBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88.5 | Pressure unresolved | onset |
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