Review of the critical current densities and magnetic irreversibilities in high T<sub>c</sub> superconductors

Sénoussi, S.

doi:10.1051/jp3:1992102

Cited by 132 publications

(90 citation statements)

References 186 publications

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“…The situation of co doping is more complicated than doping with one element. Doping alone, Mg substitutes Cu on Cu 2 O planes' site and Jc decreases as reported by various authors [15][16][17][18][19][20][21][22][23][24][25]. Our results show a different behaviour: possibility of substitution on chain's site and enhancement of Jc.…”

Section: Magnetization Measurementssupporting

confidence: 70%

“…7) at high magnetic field (Parallel field arrangement) present the same shape and indicate that the magnetisation M decreases as the concentration of Mg and Ca increases. The sample showing the best texture, deduced from XRD analysis, has the highest M as reported in [21]. For the other samples the decrease in grain size, induced by doping, corresponds to a reduction in M. In first sight, the reduction of grain size reduces the current loops and consequently the magnetisation M. One sample, doped with 5% Ca and 1% Mg does not obey this scheme.…”

Section: Magnetization Measurementsmentioning

confidence: 95%

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The influence of doping with Ca and Mg in YBa₂Cu₃O_7-δceramic

Attaf

Mosbah

Vecchione

et al. 2012

EPJ Web of Conferences

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Abstract.We have investigated the effect of partial substitution of Ca for Y and/or Mg for Cu on structural, compositional and magnetic properties in YBa 2 Cu 3 O 7-δ polycrystalline compounds. All prepared samples were found to be single phase with small fraction of Ba-secondary phases. Substitution by more than 2% of magnesium causes an increase of spurious phases. Energy Dispersive Spectroscopy (EDS) revealed that the distribution of Ca in the sample is quite homogenous. DC susceptibility measurements show that superconducting transition temperature Tc is reduced much more by Ca than Mg. Hysteresis loops reveal that magnetic irreversibility is decreased by Ca and Mg content. The deduced critical current density Jc does not follow the same variation. Ca alone reduces Jc for x=0.1 and x=0.2. Together with Ca, Mg compensates the reduction of Jc and increasing its content near the solubility limit gives higher Jc than in the undoped sample.

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Section: Magnetization Measurementssupporting

confidence: 70%

Section: Magnetization Measurementsmentioning

confidence: 95%

The influence of doping with Ca and Mg in YBa₂Cu₃O_7-δceramic

Attaf

Mosbah

Vecchione

et al. 2012

EPJ Web of Conferences

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“…The coefficient K D appears to increase fastly with temperature that is untypical for diamagnetic atoms. There are several scenarios, e.g., one can To obtain the critical current densities from the magnetization loops, one can employ the approach of Senoussi of a three-current model, 18 where the entire magnetization is composed of three contributions of the grains, the Josephson contacts between them and the shielding of the entire sample. This model can reproduce the changing shape of the measured magnetization loops, as found in an earlier publication.…”

Section: Resultsmentioning

confidence: 99%

Magnetic properties of electrospun non-woven superconducting fabrics

et al. 2016

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Non-woven superconducting fabrics were prepared by the electrospinning technique, consisting of Bi2Sr2CaCuO8 (Bi-2212) nanowires. The individual nanowires have a diameter of ∼150-200 nm and lengths of up to 100 μm. A non-woven fabric forming a network with a large number of interconnects results, which enables the flow of transport currents through the entire network. We present here magnetization data [M(T) and M(H)-loops] of this new class of superconducting material. The magnetic properties of these nanowire networks are discussed including the irreversibility line and effects of different field sweep rates, regarding the microstructure of the nanowire networks investigated by electron microscopy.

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“…The 1D case was considered in detail for a thin long strip in a longitudinal magnetic field [5], and good agreement was achieved with the conventional models [6][7][8][9] of the magnetic flux distributions in type-II superconductors. In Ref.…”

Section: Introductionmentioning

confidence: 87%

Investigation of magnetic flux gradients in hard superconductors

Bruk

Eremenko

Makedonskaya

et al. 2001

Low Temperature Physics

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[419][420][421][422][423][424] Br uk V. V., Er em enko V. V., Makedonskaya N. I., Sha baka yeva Yu. A., an d Si re nko V. A .Investig ation of magnetic flux g rad i e nts in har d super con duct orsBr uk V. V., Er em enko V. V., Makedonskaya N. I., Sha baka yeva Yu. A., an d Si re nko V. A .Investig ation of magnetic flux g rad i e nts in har d super con duct ors Analytical calculations of the transverse magnetostriction in a thin hard superconductor are presented in relation to the distributions of currents and fields within a superconducting specimen in a varied magnetic field. The approach is successfully tested on high-temperature superconductors. The flux distribution derived from magnetostriction measurements is in satisfactory agreement with that obtained from computer processing of magnetooptical images. The magnetic flux distribution below the irreversibility line of hard superconductors is derived from both original magnetization and magnetostriction measurements and image processing. Perfect consistency of the results is obtained for a family of high-temperature superconductors

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Review of the critical current densities and magnetic irreversibilities in high T_c superconductors

Abstract: The implications for the hysteresis cycle, ac-susceptibility and ac-resistivity are outlined. We shall N°7 REVIEW OF THE CRITICAL CURRENT DENSITIES 1051 HTSC such as Bi-Sr-Ca-Cu-O.

Cited by 132 publications

References 186 publications

The influence of doping with Ca and Mg in YBa₂Cu₃O_7-δceramic

The influence of doping with Ca and Mg in YBa₂Cu₃O_7-δceramic

Magnetic properties of electrospun non-woven superconducting fabrics

Investigation of magnetic flux gradients in hard superconductors

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Review of the critical current densities and magnetic irreversibilities in high Tc superconductors

Abstract: The implications for the hysteresis cycle, ac-susceptibility and ac-resistivity are outlined. We shall N°7 REVIEW OF THE CRITICAL CURRENT DENSITIES 1051 HTSC such as Bi-Sr-Ca-Cu-O.

Cited by 132 publications

References 186 publications

The influence of doping with Ca and Mg in YBa2Cu3O7-δceramic

The influence of doping with Ca and Mg in YBa2Cu3O7-δceramic

Magnetic properties of electrospun non-woven superconducting fabrics

Investigation of magnetic flux gradients in hard superconductors

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Product

Resources

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Review of the critical current densities and magnetic irreversibilities in high T_c superconductors

The influence of doping with Ca and Mg in YBa₂Cu₃O_7-δceramic

The influence of doping with Ca and Mg in YBa₂Cu₃O_7-δceramic