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- W1983212911 abstract "The magnetic flux dynamics in a large (4.3×3.4×2.8 mm3) single crystal NdBa2Cu3O7-δ sample was investigated under fully-oxygenated and oxygen-deficient conditions using vibrating sample magnetometry (VSM) and ac flux profile measurements in the B∥c-axis configuration. Using a split coil VSM the anisotropy (Γ) was determined. From the equilibrium magnetization above the irreversibility field (Birr), the London penetration depth (λ) was calculated. While a near total absence of the fishtail effect and more or less a constant J (15 000 A cm-2) in the field range of 1-10 T at 77 K was exhibited by the fully-oxygenated sample, a pronounced fishtail effect with an increase in current with a peak value of 32 000 A cm-2 was observed after oxygen reduction. However, the irreversibility field (Birr), was reduced from 13.1 to 7 T at 77 K after oxygen reduction. A vortex melting transition is indicated by the fully-oxygenated sample, with a marked deviation from this behaviour for temperatures below 86 K. A dynamic phase shift was observed through the superconducting transition which varies with field and exhibits a peak with a maximum around the irreversibility field." @default.
- W1983212911 created "2016-06-24" @default.
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- W1983212911 date "2000-08-24" @default.
- W1983212911 modified "2023-09-23" @default.
- W1983212911 title "Effect of oxygen-induced disorder on magnetic flux dynamics and critical current in a NdBa2Cu3O7-δsingle crystal" @default.
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- W1983212911 doi "https://doi.org/10.1088/0953-2048/13/9/311" @default.
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