A magnetic phase diagram describing the pinning behaviour of the ceramic Tl2Ba2Ca2Cu3Oy high-Tc superconductor

Job, R.; Rosenberg, M.; Niculescu, A.V.

doi:10.1016/0921-4534(92)90877-f

Cited by 9 publications

(1 citation statement)

References 12 publications

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“…This can be represented by the unusual temperature dependence of the irreversibility field (H irr ). Although Bi-Sr-Ca-Cu-O [2], Tl-Ba-Ca-Cu-O [3] and Hg-Ba-Ca-Cu-O [4] systems have T c values higher than that of Y-Ba-Cu-O, they seem to be inappropriate for bulk-type applications at 77 K because their irreversibility lines are drastically depressed over a wide temperature range below T c in the H -T diagram [5][6][7][8][9][10] and, as a result, their H irr are lower than that of the Y-Ba-Cu-O superconductor at 77 K. The depression of H irr is attributed to their 2D structure and thus a large superconducting anisotropy γ , defined as γ = H ab c2 /H c c2 = ξ ab /ξ c , where H c2 is the upper critical field. Because of this, the Y-Ba-Cu-O system is still the most attractive system for bulk applications at 77 K.…”

Section: Introductionmentioning

confidence: 99%

Melt-processed light rare earth element - Ba - Cu - O

Murakami

Sakai

Higuchi

et al. 1996

Supercond. Sci. Technol.

582

332

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Unlike Y123 which forms only a stoichiometric compound, the light rare earth elements (LREs: La, Nd, Sm, Eu, Gd) form a solid solution LRE 1+x Ba 2−x Cu 3 O y . The presence of such solid solution caused a depression in the superconducting transition temperatures (T c ), particularly for La123, Nd123 and Sm123 when they are melt processed in air. Recently, we have found that the T c of these LRE123 superconductors can greatly be enhanced when they are melt processed in a reduced oxygen atmosphere. Furthermore, J c values of these superconductors were larger than that of a good quality Y123 superconductor in high magnetic fields at 77 K. In this article, on the basis of our study over the last several years, the melt processes for LRE-Ba-Cu-O are described, the microstructural and superconducting properties of the superconductors are reviewed and the flux pinning mechanism is also discussed.

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Section: Introductionmentioning

confidence: 99%

Melt-processed light rare earth element - Ba - Cu - O

Murakami

Sakai

Higuchi

et al. 1996

Supercond. Sci. Technol.

582

332

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Influence of Partially Double Substitutions on the Superconductivity of Mercury-Cuprates

Gruber

Krautz

Popitsch

1998

phys. stat. sol. (a)

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Local Self-Field Measurements in Tl-2223 Polycrystalline Superconductors

Sáenz

Niculescu

Gielisse

2000

phys. stat. sol. (b)

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We report local self‐field measurements on superconducting (Tl‐2223) disks in an applied field. The axial components of the self‐field generated by polycrystalline superconductors, have been measured at points above the sample using a Hall probe. The measurements were conducted with a computer controlled precision x–y scanning assembly, at liquid nitrogen temperatures. Single point and two‐ dimensional distributions of the local self‐field above the samples immersed in a homogeneous applied field up to 16 mT, were recorded. In an increasing/decreasing magnetic field the magnetic response of the superconductors traverses hysteresis loops due to inter‐ and intragranular flux pinning. The field for full flux penetration and the maximum shielded field have been identified from characteristic points on the hysteresis loops. Evaluation of the average intergrain current density jc, assuming a uniform critical current density, resulted in the value 2.7 × 106 A/m2.

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A magnetic phase diagram describing the pinning behaviour of the ceramic Tl2Ba2Ca2Cu3Oy high-Tc superconductor

Cited by 9 publications

References 12 publications

Melt-processed light rare earth element - Ba - Cu - O

Melt-processed light rare earth element - Ba - Cu - O

Influence of Partially Double Substitutions on the Superconductivity of Mercury-Cuprates

Local Self-Field Measurements in Tl-2223 Polycrystalline Superconductors

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