Transport Barkhausen-like noise and flux-flow regime in ceramic samples

Govea-Alcaide, E.; Anglada-Rivera, J.; Jardim, R. F.; Muné, P.

doi:10.1016/j.jmmm.2005.04.007

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…The unit cells are orthorhombic, with lattice parameters a = 5.4056, b = 5.4055 and c = 37.12 Å; they remain constant within experimental errors. Similar lattice parameters were observed for compounds with almost the same stoichiometry in [34].…”

Section: Methodssupporting

confidence: 80%

The thermoelectric properties of Bi-2223 superconductors sintered at different conditions

Ibrahim¹,

Saleh²,

Ahmed³

2008

Supercond. Sci. Technol.

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Structural examinations and thermoelectric power measurements were carried out on Bi1.75Pb0.35Sr2Ca2Cu3O10 samples sintered at different conditions. The thermoelectric power of all samples was found to be positive, and it increases almost linearly with the decrease of temperature up to ∼140 K, before falling to zero at Tco. However, the thermoelectric power changes slightly with increasing sintering temperature and time. The normal state results are analyzed in terms of a two-band model with an additional term that is linear in T. The effects of sintering temperature and time on the parameters related to this model have been investigated.

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Section: Methodssupporting

confidence: 80%

The thermoelectric properties of Bi-2223 superconductors sintered at different conditions

Ibrahim¹,

Saleh²,

Ahmed³

2008

Supercond. Sci. Technol.

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“…As previously reported, the TBN signal is closely related to the transition of the material from the flux-creep to the flux-flow regime [11]. Within the experimental conditions described here, the maximum value of B a is smaller than the first thermodynamic critical field of the superconducting grains at 77 K. Therefore, the detected noise signal arises primarily from both pinning and depinning processes that mostly occur in the weak-links and/or the superconducting clusters.…”

Section: The Tbn Analysissupporting

confidence: 80%

“…[11], were performed in the superconducting state of polycrystalline samples of BSCCO (2223). The results indicated that the TBN signal is related to the transition of the material from the flux-creep to the flux-flow regime at the intergranular level, or more appropriately to the Josephson vortex motion [12,13].…”

Section: Introductionmentioning

confidence: 99%

Transport Barkhausen-like noise in uniaxially pressed Bi1.65Pb0.35Sr2Ca2Cu3O10+ ceramic samples

García-Fornaris

Govea-Alcaide

Alberteris-Campos

et al. 2010

Physica C: Superconductivity

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a b s t r a c tWe report on the detection of the transport Barkhausen-like noise (TBN) in polycrystalline samples of Bi 1.65 Pb 0.35 Sr 2 Ca 2 Cu 3 O 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 $ 1 Hz) with maximum amplitude B max % 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 a (t 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 c superconductors.

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“…The transport Barkhausen-like noise (TBN) [10,11], also referred to as transport noise (TN), was detected by using the experimental setup displayed in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

Experimental and theoretical study of transport properties in uniaxially pressed (Bi,Pb)2Sr2Ca
García-Fornaris
¹
,
Muné
²
,
Suzuki
³

et al. 2010
Physica C: Superconductivity
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0
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a b s t r a c tExperimental and theoretical studies on the magnetic field dependence of the electrical resistance RðB a Þ and the transport noise (TN) in polycrystalline high-T c superconductors subjected to different uniaxial compacting pressures were conducted. X-ray diffraction rocking curves were performed in different surfaces of the samples in order to investigated the degree of texture. The results indicated an improvement of the degree of texture with increasing the uniaxial compacting pressure. In theoretical simulations of the data, the polycrystalline superconductors were described as a series-parallel array of Josephson devices. The intergranular magnetic field is described within the framework of the intragranular fluxtrapping model and the distribution of the grain-boundary angles is assumed to follow the Rayleigh statistical function. The proposed model describes well the experimental magnetoresistance RðB a Þ data. We have found that the behavior of the RðB a Þ curves changes appreciably when different uniaxially compacting pressures are applied to the sample and such a changes are reproduced by the model when different grain-boundary angles distributions are used. In addition, changes in the RðB a Þ dependence have their counterparts in the experimental transport noise signals.

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Transport Barkhausen-like noise and flux-flow regime in ceramic samples

Cited by 7 publications

References 29 publications

The thermoelectric properties of Bi-2223 superconductors sintered at different conditions

The thermoelectric properties of Bi-2223 superconductors sintered at different conditions

Transport Barkhausen-like noise in uniaxially pressed Bi1.65Pb0.35Sr2Ca2Cu3O10+ ceramic samples

Experimental and theoretical study of transport properties in uniaxially pressed (Bi,Pb)2Sr2Ca
García-Fornaris
¹
,
Muné
²
,
Suzuki
³

et al. 2010
Physica C: Superconductivity
Self Cite
3
0
0
0
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Transport Barkhausen-like noise and flux-flow regime in ceramic samples

Cited by 7 publications

References 29 publications

The thermoelectric properties of Bi-2223 superconductors sintered at different conditions

The thermoelectric properties of Bi-2223 superconductors sintered at different conditions

Transport Barkhausen-like noise in uniaxially pressed Bi1.65Pb0.35Sr2Ca2Cu3O10+ ceramic samples

Experimental and theoretical study of transport properties in uniaxially pressed (Bi,Pb)2Sr2CaGarcía-Fornaris1, Muné2, Suzuki3 et al. 2010Physica C: SuperconductivitySelf Cite3000View full textAdd to dashboardCite

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Experimental and theoretical study of transport properties in uniaxially pressed (Bi,Pb)2Sr2Ca
García-Fornaris
¹
,
Muné
²
,
Suzuki
³

et al. 2010
Physica C: Superconductivity
Self Cite
3
0
0
0
View full text Add to dashboard Cite