Flux pinning at grain boundaries in Bi-(Pb)-Sr-Ca-Cu-O ceramic superconductors
K.-H. Müller, M. Nikolo, R. Driver
DOI 10.1103/PhysRevB.43.7976 · Physical Review B
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Abstract
For low magnetic-field amplitudes the imaginary part of the ac susceptibility, χ’’(T), in ceramic high-temperature superconductors represents the intergranular bulk pinning loss. The loss peak at Tp shifts to lower temperature with increasing ac field and to higher temperature with increasing frequency. We have measured the shift of the χ’’ peak in ceramic Bi-(Pb)-Sr-Ca-Cu-O samples. The Anderson flux-creep model in conjunction with the critical-state model for Josephson vortices is employed to explain quantitatively the dependence of Tp on frequency and ac field. The model allows the determination of the intergranular pinning potential, where pinning occurs at grain-boundary intersection points.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 107 | Pressure not reported | onset |
| Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 103 | Pressure not reported | zero_resistance |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 73 | Pressure not reported | zero_resistance |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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