Alternating-Field Susceptometry and Magnetic Susceptibility of Superconductors

Goldfarb, Ronald B.; Lelental, M.; Thompson, Carol

doi:10.1007/978-1-4899-2379-0_3

Cited by 113 publications

(98 citation statements)

References 153 publications

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“…According to the single-phase description, both the 2212 and the 2223 phase should contribute with a highly superconducting grain component and with a poorly superconducting matrix component, but in the investigated temperature range both the 2212 phase components are in the normal non-diamagnetic state. On the other hand, as far as the 2223 phase is concerned, it has been shown for systems similar to ours [29,30] that at about the applied ®eld of H 200 A/m the superconductivity of the 2223 phase matrix component is strongly suppressed at least for T > 90 K. Therefore, in order to apply the two component model to our samples, it is necessary to identify the spherical grains with the 2223 phase highly superconducting grain component, while the embedding medium consists of the 2223 phase poorly superconducting matrix component, both the 2212 phase components (matrix and grains) plus, obviously, the detected impurities and voids. The request for the embedding medium to be non magnetic is full®lled by the fact that these superconducting components are in the normal state.…”

Section: Resultssupporting

confidence: 66%

Annealing temperature dependence of the 2223 phase volume fraction in the Bi–Sr–Ca–Cu–O system

Manfredotti

Truccato

Rinaudo

et al. 2001

Physica C: Superconductivity

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We have developed a reliable method based on AC magnetic susceptibility measurements to determine the Bi 2 Sr 2 Ca 2 Cu 3 O 10x (2223) phase volume fraction and the average grain radius in multiphasic polycrystalline Bi±Sr±Ca± Cu±O samples. Precision and applicability of the method are discussed and compared with those of the XRD peak integration procedure. The method is used to investigate the in¯uence of the annealing temperature on the synthesis of the 2223 phase in air. The results show that, for a 120 h annealing time, T 849°C is the most favourable among the investigated temperatures. Evidence is also given that higher temperatures promote the decomposition of the 2223 phase into the Bi 2 Sr 2 CaCu 2 O 8x (2212) phase and impurities. Ó

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Section: Resultssupporting

confidence: 66%

Annealing temperature dependence of the 2223 phase volume fraction in the Bi–Sr–Ca–Cu–O system

Manfredotti

Truccato

Rinaudo

et al. 2001

Physica C: Superconductivity

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“…To relate the two geometries we briefly discuss demagnetization effects. 80,81 As a model sample of finite dimensions, we consider an oblate ellipsoid of revolution about the z axis for which the demagnetizing factor is 81…”

Section: B H M and Demagnetization In Oblate Ellipsoids And Fmentioning

confidence: 99%

Equilibrium intermediate-state patterns in a type-I superconducting slab in an arbitrarily oriented applied magnetic field

Clem

Prozorov²,

Wijngaarden³

2013

Phys. Rev. B

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The equilibrium topology of superconducting and normal domains in flat type-I superconductors is investigated. Important improvements with respect to previous work are: (1) the energy of the external magnetic field, as deformed by the presence of superconducting domains, is calculated in the same way for three different topologies, and (2) calculations are made for arbitrary orientation of the applied field. A phase diagram is presented for the minimum-energy topology as a function of applied field magnitude and angle. For small (large) applied fields normal (superconducting) tubes are found, while for intermediate fields parallel domains have a lower energy. The range of field magnitudes for which the superconducting-tubes structure is favored shrinks when the field is more in-plane oriented.

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“…j c (B) is constant (Bean, 1964). Analytical solutions for magnetization loops are known for an infinitely long slab or cylinder in a parallel field (Goldfarb, 1991) and thin disk (Clem & Sanchez, 1994;Mikheenko & Kuzovlev, 1993) or strip (Brandt, 1993) in a perpendicular field. In these cases the 3D partial differential equation (PDE) Eq.…”

Section: Bean Critical Statementioning

confidence: 99%