Quasi-static magnetic behaviour of a disc-shaped type II superconductor

Doyle, T. B.; Labusch, R.; Doyle, R. A.

doi:10.1016/s0921-4534(97)01618-3

Cited by 52 publications

(23 citation statements)

References 44 publications

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“…͑3͒ in the data analysis because this form of dM /d(lnH) yields the correct extrapolation of the differential data to zero field, from which the value of the penetration depth is derived. We thus determined the curves of 2 (0)/ 2 (T) ͓and H c1 (T)͔, which closely coincides with the data derived by other methods, 12,14,50 except the methods employing the initial flux penetration. 36 …”

Section: Discussionsupporting

confidence: 77%

Determination of magnetic penetration depth from the reversible magnetization inBi2Sr2CaCu<

Rykov

Tamegai

2001

Phys. Rev. B

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The reversible magnetization in Bi 2 Sr 2 CaCu 2 O 8ϩ␦ is analyzed within existing theoretical models. The field-induced suppression of the empirical ''superfluid density'' dM /d(lnH) are compared for the fluctuation mechanism and for the suppression of the order parameter in the vortex core. The thermal fluctuation term is found to be essentially reduced compared to the theoretical prediction for decoupled pancake vortices. We suggest that the energy of Josephson and magnetic coupling between two-dimensional ͑2D͒ layers is at the origin of observed decrease in the entropy term. The interlayer coupling is best maintained in samples with reduced disorder. In the samples of the best quality, the fluctuation contribution to the reversible magnetization drops down to less than k B T/10s⌽ 0 (sϷ15.4 Å ). Taking into account this reduction we obtain the curve 2 (0)/ 2 (T) versus T from the reversible magnetization similar to the one obtained from measurements of microwave surface impedance, which is also consistent with H c1 derived from micro-Hall ac technique. The accuracy of determination of H c1 from the scaled M vs T curves is found to be even better than that for 2 (0)/ 2 (T). It is frequently assumed, 5 that 0 is linear with 1 ϪT/T c0 and its derivative on the dimensionless parameter ϭ1ϪT/T c0 is 0 ЈϷ2 0 (0). Here T c0 is the mean-field critical temperature, which may be larger than the measured

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Section: Discussionsupporting

confidence: 77%

Determination of magnetic penetration depth from the reversible magnetization inBi2Sr2CaCu<

Rykov

Tamegai

2001

Phys. Rev. B

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“…Several results of our analytical approach have been confirmed independently by numerical calculations. [13][14][15] In the present paper, we extend the calculations of Ref. 12 to compute the critical current I c (H a ) due to both geometrical and Bean-Livingston barriers, to which we will refer collectively as surface barriers.…”

Section: Introductionmentioning

confidence: 96%

Critical current from surface barriers in type-II superconducting strips

Benkraouda

Clem

1998

Phys. Rev. B

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Extending a model we previously used to calculate magnetization hysteresis arising from the geometrical barrier in a flat, bulk-pinning-free type-II superconducting strip subjected to a perpendicular magnetic field H a , we here calculate the contribution, arising from screening currents on the top and bottom surfaces, to the magnetic-field-dependent critical current I c (H a ) due to surface barriers, including both the geometrical barrier and the Bean-Livingston barrier. ͓S0163-1829͑98͒04946-7͔

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“…A further step was presented when the critical-state model was extended to the case of very thin strips 18 -20 and disks, [21][22][23] for which important demagnetizing fields were involved. More recently, the more general case of a critical state in samples with finite thickness, such as strips 24 and cylinders, [25][26][27] was solved by numerical models.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of arrays of superconducting strips in a perpendicular field

2003

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Current profiles and field lines and magnetization and ac losses are calculated for arrays of infinitely long superconducting strips in the critical state in a perpendicularly applied magnetic field. The strips are arranged vertically, horizontally, and in a matrix configuration, which are the geometries found in many actual high-T c superconducting tapes. The finite thickness of the strips and the effects of demagnetizing fields are considered. Systematic results for the magnetization and ac losses of the arrays are obtained as function of the geometry and separation of the constituent strips. Results allow us to understand some unexplained features observed in experiments, as well as to propose some future directions.

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Quasi-static magnetic behaviour of a disc-shaped type II superconductor

Cited by 52 publications

References 44 publications

Determination of magnetic penetration depth from the reversible magnetization inBi2Sr2CaCu<

Determination of magnetic penetration depth from the reversible magnetization inBi2Sr2CaCu<

Critical current from surface barriers in type-II superconducting strips

Magnetic properties of arrays of superconducting strips in a perpendicular field

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