The irreversibility line in polycrystalline YBa2Cu3O7 superconductors with Y2BaCuO5 inclusions

Elabbar, A.A.; King, P. J.; Maxwell, K.J.; Owers‐Bradley, J. R.; Roys, W.B.

doi:10.1016/0921-4534(92)90269-i

Cited by 10 publications

(4 citation statements)

References 33 publications

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“…Analogous phenomena were observed by Loegel et al[31] on differently treated samples and by EI-Abbar in YBCO-YzBaCuO5 composites[32].3.3.3. For higher Au concentrations this latter parameter tends to decrease.…”

supporting

confidence: 83%

“…interesting to study the effect of this substitution on the behaviour of the intragrain flux lines. These large values have already been observed in many cases [32] for granular anisotropic superconductors and also for isotropic Chevrel phase superconductors [33]. 10 we only show the influence of static field H on Z' and Z" for pure YBCO and x = 0.05 and 0.3.…”

Section: Ac Fiom Effectmentioning

confidence: 43%

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Superconducting properties of YBa2Cu3O7-Au composites

et al. 1993

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By X-ray diffraction and photoelectron spectroscopy, we have demonstrated that Au is incorporated in the YBCO lattice up to a concentration 0.1. An XPS study gave evidence for an electronic valence state Au 1 +. Its replacement in the Cu(1 ) site appears questionable due to the large difference in ionic radii (Cu2+: 0.073 nm; Au 1+: 0.1 37 nm). The so called 'irreversibility lines' determined by AC susceptibility measurements are strongly affected by the doping. Up to the limit of solubility in the grains, an improvement in intra and intergrain coupling and flux pinning energy is observed, showing the beneficial interest of YBCO-Au composites.

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supporting

confidence: 83%

Section: Ac Fiom Effectmentioning

confidence: 43%

Superconducting properties of YBa2Cu3O7-Au composites

et al. 1993

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“…For YBa,-,Cu,O,, q = 0.525 when x = 0 and q = 0.325 when x = 1 as shown in figure 12. These results are in good agreement with the data of El Abbar et ai [21] who have investigated the irreversible behaviour of YBa,Cu,O, : YBaCuO, composites. The shift of this IL to lower temperatures and the decrease of the qexponent for x = 1 compared with x = 0 are related to a weakening of the intergranular couplings and of the pinning force of flux lines into the junctions resulting from the presence of 211-phase.…”

Section: (R!d)ba-cuo Materialssupporting

confidence: 92%

Effect of a barium deficiency on the structural and magnetic properties of RE Ba_2-xCu₃O_z(RE=Y, Nd, Eu, Er, Yb)

Sauv

Nicolas

Huong

et al. 1993

Supercond. Sci. Technol.

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A barium deficiency in the"initia1 composition for the synthesis of high-temperature supercondutors (HTSC), i.e. a nominal (RE Ba,-xCu,O,) composition with 0 $ x $ 1 leads to different materials depending on the nature of the rare earth. If the rare earth is 'yltric' (Y, Er, Yb), the resulting compound is a composite YBa,Cu,O, + Y,BaCuO,, whose critical current density depends on the x-value. The determination of the irreversible behaviour by means of AC susceptibility or magnetization measurements shows that in the presence of the 21 1-phase, the intergranular current-density decreases whereas the intragranular current density varies very little. If the rare earth is 'ceric' (Nd, Eu), the lack of barium leads to a quasi single-phased compound. In t h e Nd-case, the critical current density decreases strongly with increasingx. At highx (0.5 < x < 1) and low temperature, t h e magnetization-against-fieid data show paramagnetic behaviour due to the neodymium ions, with an effective momentp.,,,= 1.80 p a . The domain of the reversible behaviour in the (H, r) plane is more extended forNbBaCu0 and EuBaCuO than for YBaCuO.

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“…At low ac fields, the experimental data cannot be described by Eq. (12). It is worth noting that according to Bean's critical state model, the height of the v 00 peak is independent of the amplitude of H ac .…”

Section: Resultsmentioning

confidence: 98%

AC response of YBa2Cu3O7 thin film superconductor

Elabbar

2009

Physica C: Superconductivity

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The irreversibility line in polycrystalline YBa2Cu3O7 superconductors with Y2BaCuO5 inclusions

Cited by 10 publications

References 33 publications

Superconducting properties of YBa2Cu3O7-Au composites

Superconducting properties of YBa2Cu3O7-Au composites

Effect of a barium deficiency on the structural and magnetic properties of RE Ba_2-xCu₃O_z(RE=Y, Nd, Eu, Er, Yb)

AC response of YBa2Cu3O7 thin film superconductor

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The irreversibility line in polycrystalline YBa2Cu3O7 superconductors with Y2BaCuO5 inclusions

Cited by 10 publications

References 33 publications

Superconducting properties of YBa2Cu3O7-Au composites

Superconducting properties of YBa2Cu3O7-Au composites

Effect of a barium deficiency on the structural and magnetic properties of RE Ba2-xCu3Oz(RE=Y, Nd, Eu, Er, Yb)

AC response of YBa2Cu3O7 thin film superconductor

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Effect of a barium deficiency on the structural and magnetic properties of RE Ba_2-xCu₃O_z(RE=Y, Nd, Eu, Er, Yb)