Universal behavior of harmonic susceptibilities in type-II superconductors

Shatz, Smadar; Shaulov, A.; Yeshurun, Y.

doi:10.1103/physrevb.48.13871

Cited by 68 publications

(47 citation statements)

References 15 publications

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“…In the Bean model δ=h ac /H*, where H* is the smallest field that penetrate the whole sample. The AC susceptibility harmonics, calculated by using any critical state model, are independent of the frequency ν of the applied AC field [10]. Nevertheless, many experimental results show that variations of all the harmonics χ n appear in correspondence of different AC frequencies.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, non zero even harmonics are predicted, by the Kim critical state model, in which a magnetic field dependent J c is considered [7][8][9]. Shatz et al [10] showed that all the critical state models can be described in terms of a unique parameter δ, which measures the extent of penetration of the AC field into the slab. δ depends on the slope S of the field profile inside the sample (the slope S being a function of the temperature and the field dependent J c ), on the applied magnetic field h ac and on the geometrical dimension of the sample.…”

Section: Introductionmentioning

confidence: 99%

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Third harmonics of the AC magnetic susceptibility: a method for the study of flux dynamics in high temperature superconductors

Polichetti

Adesso

Pace

2003

The European Physical Journal B - Condensed Matter

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Third harmonics of the AC magnetic susceptibility: a method for the study of flux dynamics in high temperature superconductors

Polichetti

Adesso

Pace

2003

The European Physical Journal B - Condensed Matter

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“…2b the Cole-Cole plots, i.e., a plot of χ" 3 vs. χ' 3 , of the two samples under the same magnetic field and frequency. As the reference, represented by the dashed curve, we have also plotted the Bean's model independent of the frequency, [54,55] corresponding to a homogeneous bulk pinning 'lens' shape [56]. The curves reveal a similar bulk flux-pinning interaction for both NdFeAsO 0.86 F 0.14 and FeSe 0.88 samples although the area of the former is larger.…”

Section: Resultsmentioning

confidence: 99%

Effect of spacer layer on flux-pinning properties of iron-based superconductors

Gioacchino¹,

Poccia²,

Marcelli³

et al. 2016

Novel Superconducting Materials

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Abstract:We investigated the magnetic flux-pinning in iron-based 1111-type (REFeAsO, RE= rare earth) and 11-type (FeSe 1−x Tex) superconductors by third harmonic acmagnetic susceptibility measurements, a technique sensitive to the dynamics of magnetization, probing non-linear processes in flux pinning transport. Despite the larger thermal fluctuations due to the high critical temperature and large anisotropy, flux dynamics of 1111-type pnictides points out a more efficient pinning mechanism than the one in the 11-type chalcogenides. We have associated the stronger pinning in the 1111-family to the presence of REO (RE=rare earth) spacer layers separating the active FeAslayers unlike the 11-chalcogenides in which no spacer layers are present. Therefore, the disorder in the FeAs layers induced by the misfit strain due to spacer layers has an important role in the enhanced flux pinning of 1111-type superconductors.

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“…Also a field-dependence of J c (B) is not accounted for in the model and it may be found in harmonics higher than the fundamental. However, S. Shatz et al [6] have shown that the Kim-Anderson model with J c = J c (B) also yields a universal behavior in the curves which in consequence does not produce the additional peaks. This fact has the importance conclusion: that the observed peaks must be caused only by thermal effects as the transition occurs.…”

Section: Resultsmentioning

confidence: 99%

Critical current density and ac harmonic voltage generation in YBa2Cu3O7-δ

Pérez-López

Gamboa

Sosa

2010

Physica C: Superconductivity and its Applications

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The temperature and field dependence of harmonics in voltage V n = V n − iV n using the screening technique have been measured for YBa 2 Cu 3 O 7−δ superconducting thin films. Using the Sun model we obtained the curves for the temperature-dependent critical current density J c (T ). In addition, we applied the criterion proposed by Acosta et al. to compute J c (T ). Also, we made used of the empirical law J c ∝ (1 − T /T c ) n as an input in our calculations to reproduce experimental harmonic generation up to the fifth harmonic. We found that most models fit well the fundamental voltage but higher harmonics are poorly reproduced. Such behavior suggests the idea that higher harmonics contain information concerning complex processes like flux creep or thermally assisted flux flow.

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Universal behavior of harmonic susceptibilities in type-II superconductors

Cited by 68 publications

References 15 publications

Third harmonics of the AC magnetic susceptibility: a method for the study of flux dynamics in high temperature superconductors

Third harmonics of the AC magnetic susceptibility: a method for the study of flux dynamics in high temperature superconductors

Effect of spacer layer on flux-pinning properties of iron-based superconductors

Critical current density and ac harmonic voltage generation in YBa2Cu3O7-δ

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