Transport Barkhausen-like noise in uniaxially pressed Bi sub(1.65)Pb sub(0.35)Sr sub(2)Ca sub(2)Cu sub(3)O sub(10+)dceramic samples

We report on the detection of the transport Barkhausen-like noise (TBN) in polycrystalline samples of Bi sub(1.65)Pb sub(0.35)Sr sub(2)Ca sub(2) Cu sub(3)O sub(10+)d(Bi-2223) which were subjected to different uniaxial compacting pressures. The transport Barkhausen-like noise was measured when the sa...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2010-08, Vol.470 (15-16), p.611-616
Main Authors: Garcia-Fornaris, I, Govea-Alcaide, E, Alberteris-Campos, M, Mune, P, Jardim, R F
Format: Article
Language:English
Subjects:
Asymptotic properties
Barkhausen effect
CERAMICS
COPPER OXIDE
CURRENT DENSITY
DENSITY
FLUX PINNING
Grains
MAGNETIC FIELD
Magnetic fields
NOISE
PROPERTIES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
Transport
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Summary:We report on the detection of the transport Barkhausen-like noise (TBN) in polycrystalline samples of Bi sub(1.65)Pb sub(0.35)Sr sub(2)Ca sub(2) Cu sub(3)O sub(10+)d(Bi-2223) which were subjected to different uniaxial compacting pressures. The transport Barkhausen-like noise was measured when the sample was subjected to an ac triangular-shape magnetic field (f [not, vert, similar] 1 Hz) with maximum amplitude B sub()max[asymptotic to] 5.5 mT, in order to avoid the flux penetration within the superconducting grains. Analysis of the TBN signal, measured for several values of excitation current density, indicated that the applied magnetic field in which the noise signal first appears, B sub()at sub()i, is closely related to the magnetic-flux pinning capability of the material. The combined results are consistent with the existence of three different superconducting levels within the samples: (i) the superconducting grains; (ii) the superconducting clusters; and (iii) the weak-links. We finally argue that TBN measurements constitute a powerful tool for probing features of the intergranular transport properties in polycrystalline samples of high-T sub()csuperconductors.
ISSN:0921-4534
DOI:10.1016/j.physc.2010.05.242