Critical currents versus normal-state resistivity in granular BiPb-based copper-oxide superconductors

Díaz, A.; Pomar, A.; Domarco, G.; Maza, J.; Vidal, F.

doi:10.1063/1.358998

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…ρ wl in our Ag 10 wt.% composite samples is 42 µ cm (table 2). This value is of the same order as ρ ab (T ) measured in single crystal and thin films, which varies from 50 µ cm at 100 K to 150 µ cm at 300 K [42]. Increasing Ag concentration above 10 wt.% results in further decrease of ρ wl , which even becomes less than the intragranular ρ ab (T ).…”

Section: Evolution Of Intergranular Resistivity With Ag Content and R...supporting

confidence: 61%

Granularity controlled percolative current conduction in YBa₂Cu₃O₇/Ag composite thick films

Behera

Mishra

2001

Supercond. Sci. Technol.

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Temperature-dependent electrical resistivity in a set of YBa 2 Cu 3 O 7 /Ag thick films prepared by reaction diffusion technique is analysed to estimate the extent of granularity in them. Percolative nature of charge transfer in the films was examined by studying the excess conductivity in the superconducting order parameter fluctuation (SCOPF) region (T T c ), the approach to zero-resistance state in the tail region, the current-controlled tailing of the resistivity transition near T c 0 (T c 0 < T < T c 0 ) and the current-voltage characteristics in the paracoherent regime (T < T c 0 ) with their associated exponents. The percolative current model was thus utilized to quantify granularity in the films of such parameters like the weak link resistivity across grain boundaries, current path lengthening factor arising due to grain misalignment, and due to voids and cracks. Evolution of these parameters with Ag content in the films indicates reduced structural defects (voids and cracks) at higher Ag concentrations. The result points to a mechanism of grain growth in the composites, which accounts for the improved grain growth with narrower grain size distribution in these systems as compared to that in Ag-free YBCO sintered material. These microstructural modifications cause lowering of percolation threshold from the value expected in a granular system where the grain size approaches to one of the system dimensions (the film thickness) making the conduction through grain boundary essentially two-dimensional.

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Section: Evolution Of Intergranular Resistivity With Ag Content and R...supporting

confidence: 61%

Granularity controlled percolative current conduction in YBa₂Cu₃O₇/Ag composite thick films

Behera

Mishra

2001

Supercond. Sci. Technol.

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“…T c (which is defined by ρ ab (T c ) = 0 in Ref. 22) is very close to the T cG value obtained from the a.c. susceptibility data. In our samples, the zero resistivity temperature T c (ρ = 0) (associated to the quality of grain boundary junction) is nearly the same as T i derived from a.c. susceptibility.…”

Section: Resultssupporting

confidence: 84%

“…Structural defects and inhomogenities force the current to meander through the cuprate enhancing the normal resistivity. The measured normal resistivity in bulk samples is related to the intrinsic resistivity in CuO 2 (a-b) plane of a single crystal, by the relation 21,22 :…”

Section: Resultsmentioning

confidence: 99%

ELECTRICAL AND MAGNETIC PROPERTIES OF BULK (Bi_1.6Pb_0.4)(Sr_1.8Ba_0,2)(Ca_1-xEr_x)₂Cu₃O_y SUPERCONDUCTING SYSTEM

Pop

Deac

Ilonca

et al. 2000

Int. J. Mod. Phys. B

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The effects of partial substitution of Ca by Er on the superconductivity and normal state properties of the bulk superconductor (Bi 1.6 Pb 0.4 )(Sr 1.8 Ba 0.2 )(Ca 1−x Erx) 2 Cu 3 Oy (0 ≤ x ≤ 0.2) have been investigated using electrical resistivity, a.c. and d.c. magnetic susceptibility measurements.Above the excess conductivity region, all samples are characterised by a linear temperature dependence of the electrical resistivity. The analysis of the resistivity data in the normal state reveal that the residual resistivity and the parameter p (related to the percolation path in granular samples) increase with increasing x. The critical transition temperature determined from resistivity data, Tc and Tc(ρ = 0), are identical to intraand intergrain critical temperatures derived from the a.c. susceptibility measurements. These temperatures decreases linearly with increasing Er content. For samples with x ≤ 0.005 a temperature independent susceptibility was evidenced and for x > 0.005 the susceptibility data as a function of temperature is well described by a Curie-Weiss law with an effective magnetic moment corresponding to the Er 3+ ion.PACS number(s): 74.62. Dh, 74.72.Hs, 74.25.Fy, 74.25.Ha

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“…9 By a Zn substitution x = 0.02 the decrease in the intragrain and intergrain transition temperatures is ∆T cG = 2 K and ∆T p = 25 K respectively. This result suggests that the inter-and intragrain properties are differently affected in the x ≤ 0.02 substitution range.…”

Section: Resultsmentioning

confidence: 99%

“…11 Because the intragrain properties were little affected by Zn ions (as suggest the small decrease ∆T c = 2 K), the same value C was assumed for x = 0.02 and x = 0.05 sample respectively. The increase of the average intergrain resistivity, ρ ct with increasing x (Table 2), agree with the decrease of T p obtained from ac susceptibility measurements.…”

Section: Resultsmentioning

confidence: 99%

AC Susceptibilities and Electrical Resistance of (Bi_1.6Pb_0.4)(Sr_1.8Ba_0.2)Ca₂(Cu_1-xZn_x)₃O_y Superconductor

et al. 1998

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Ac susceptibility and electrical resistivity measurements as a function of temperature have been carried out on the samples with x = 0.00, 0.02 and 0.05 Zn. The decrease of inter-and intragrain critical temperatures with increasing x is in agreement with the increase of the residual resistivity. The intergrain properties are more influenced than the intragrain ones. The granularity parameters p and ρct were evaluated from resistivity data. PACS Numbers: 74.72Hs, 74.25.Fy, 74.25.Ha, 74.62.Dh 419 Mod. Phys. Lett. B 1998.12:419-425. Downloaded from www.worldscientific.com by MONASH UNIVERSITY on 02/03/15. For personal use only.

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Critical currents versus normal-state resistivity in granular BiPb-based copper-oxide superconductors

Cited by 16 publications

References 33 publications

Granularity controlled percolative current conduction in YBa₂Cu₃O₇/Ag composite thick films

Granularity controlled percolative current conduction in YBa₂Cu₃O₇/Ag composite thick films

ELECTRICAL AND MAGNETIC PROPERTIES OF BULK (Bi_1.6Pb_0.4)(Sr_1.8Ba_0,2)(Ca_1-xEr_x)₂Cu₃O_y SUPERCONDUCTING SYSTEM

AC Susceptibilities and Electrical Resistance of (Bi_1.6Pb_0.4)(Sr_1.8Ba_0.2)Ca₂(Cu_1-xZn_x)₃O_y Superconductor

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Critical currents versus normal-state resistivity in granular BiPb-based copper-oxide superconductors

Cited by 16 publications

References 33 publications

Granularity controlled percolative current conduction in YBa2Cu3O7/Ag composite thick films

Granularity controlled percolative current conduction in YBa2Cu3O7/Ag composite thick films

ELECTRICAL AND MAGNETIC PROPERTIES OF BULK (Bi1.6Pb0.4)(Sr1.8Ba0,2)(Ca1-xErx)2Cu3Oy SUPERCONDUCTING SYSTEM

AC Susceptibilities and Electrical Resistance of (Bi1.6Pb0.4)(Sr1.8Ba0.2)Ca2(Cu1-xZnx)3Oy Superconductor

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Granularity controlled percolative current conduction in YBa₂Cu₃O₇/Ag composite thick films

Granularity controlled percolative current conduction in YBa₂Cu₃O₇/Ag composite thick films

ELECTRICAL AND MAGNETIC PROPERTIES OF BULK (Bi_1.6Pb_0.4)(Sr_1.8Ba_0,2)(Ca_1-xEr_x)₂Cu₃O_y SUPERCONDUCTING SYSTEM

AC Susceptibilities and Electrical Resistance of (Bi_1.6Pb_0.4)(Sr_1.8Ba_0.2)Ca₂(Cu_1-xZn_x)₃O_y Superconductor