Generation of Jc(He) hysteresis curves for granular YBa2Cu3O7-δ superconductors

Altshuler, E.; Musa, J. E.; Barroso, Joaquim J.; Papa, Andrés R. R.; Venegas, V.

doi:10.1016/0011-2275(93)90051-o

Cited by 42 publications

(19 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We stress that calculations for finite geometries [62,[66][67][68] generate double valued curves for H R versus M G . Hence, in disagreement with the assumption of Altshuler et al [1] and several workers [7,8,10,18], H R = K M G . LeBlanc and Rezeq [68] have shown that this feature accounts for the observations of Kwasnitza and Widmer [37] of double valued I C curves, after their specimen was subjected to different previous field-temperature histories generating identical magnetic moments, in the same final fields and same final temperature.…”

Section: Background and Framework Of Our Analysismentioning

confidence: 73%

“…We, and other workers [7,8,10,18], also adopt this simple picture. To develop expressions for the evolution of H R as a function of H M , Altshuler et al exploit the Bean-London [64,65] critical state model where J CG , the intragranular critical current density, is taken independent of the magnetic field.…”

Section: Background and Framework Of Our Analysismentioning

confidence: 85%

“…To develop expressions for the evolution of H R as a function of H M , Altshuler et al exploit the Bean-London [64,65] critical state model where J CG , the intragranular critical current density, is taken independent of the magnetic field. Altshuler et al [1], and other workers [8,10,18] . This displays their observations of a peak in dI CO /d ln t versus H M , the solid line is calculated from the model they described [3].…”

Section: Background and Framework Of Our Analysismentioning

confidence: 94%

“…others [7,8,10,18] assume that the return field H R is proportional to M G , the magnetization of an idealized (infinite) slab, hence write H R = K M G , where K is an adjustable coefficient. We stress that the textbook application of Ampère's law, H · d l = I , to idealized (infinite) slab geometry leads to a uniform return field permeating the infinite space outside the slab, hence an infinitesimal, i.e.…”

Section: Background and Framework Of Our Analysismentioning

confidence: 99%

“…To mathematically formulate this concept Altshuler et al, and many workers [8,10,18,22], exploit the following Fraunhoferlike equation, …”

Section: Origin Of the DI Co /D Ln T Peak In The Model Of Altshuler Ementioning

confidence: 99%

See 4 more Smart Citations

The three-particle problem in a model of light radiation

Zhukov¹,

Minlos²

1995

Russ. Math. Surv.

View full text Add to dashboard Cite

Altshuler et al discovered that dI CO /d ln t, the rate of increase of the critical current I C with time in polycrystalline high T C samples, traced a peak when measured versus H M , the amplitude of the sweep of the flux trapping magnetic field. We show that the sharp peak in dI CO /d ln t which their model generates arises from a special feature of the formulae they use to describe I C versus H M . Pursuing an extension of these formulae, and exploiting a Brandt-Indenbom formula for the return field of the magnetized grains, we (i) reproduce observations of Altshuler et al, Batista-Leyva et al and a family of curves of dI CO /d ln t reported by Cobas et al, and (ii) estimate the return fields. We also explore the peak structure of dI CO /d ln t versus H M generated by using two well known empirical expressions for I C (H), and the Brandt-Indenbom formula.

show abstract

Section: Background and Framework Of Our Analysismentioning

confidence: 73%

Section: Background and Framework Of Our Analysismentioning

confidence: 85%

Section: Background and Framework Of Our Analysismentioning

confidence: 94%

Section: Background and Framework Of Our Analysismentioning

confidence: 99%

“…To mathematically formulate this concept Altshuler et al, and many workers [8,10,18,22], exploit the following Fraunhoferlike equation, …”

Section: Origin Of the DI Co /D Ln T Peak In The Model Of Altshuler Ementioning

confidence: 99%

See 3 more Smart Citations

The three-particle problem in a model of light radiation

Zhukov¹,

Minlos²

1995

Russ. Math. Surv.

View full text Add to dashboard Cite

show abstract

Magnetoresistance, transport noise and granular structure in polycrystalline superconductors

García-Fornaris

Govea-Alcaide

Muné

et al. 2007

Physica Status Solidi (a)

View full text Add to dashboard Cite

In this work we present a theoretical study on the magnetic field dependence of the electrical resistance R (Ba) and the transport noise (TN) in a high‐Tc polycrystalline superconductors. In the model, we have considered the ceramic superconductor as a series‐parallel array of Josephson devices and the intergranular magnetic field is described within the framework of the intragranular flux‐trapping model. The obtained results qualitatively reproduce the hysteretic behavior of the R (Ba) dependence in increasing and decreasing applied magnetic fields. We have found that the hysteretic behavior in the R (Ba) dependence changes appreciably if different statistical distributions of the geometric factors of grains are used. In addition, such changes are also reflected in the TN, which is produced by the electric current rearrangement in the array with increasing applied magnetic fields. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract