Vortex dynamics in pure and SiC-doped MgB2

Keshavarzi, S.; Qin, M.J.; Soltanian, Saeid; Liu, H.K.; Dou, Shi Xue

doi:10.1016/j.physc.2004.03.046

Cited by 21 publications

(7 citation statements)

References 7 publications

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“…The peak of the f p curves takes place at b peak ϳ 0.2 for all samples, which seems to be intrinsic to bulk MgB 2 . This position of the peak has been observed in MgB 2 in many other works [13][14][15][16][17] and also in some LTSs, such as the A-15 Nb 3 Sn ͑Refs. 18-20͒ and the Chevrel-phase PbMo 6 S 8 , 21 characterized by F p ϰ b 1/2 ͑1−b͒ 2 .…”

Section: Flux Pinning Curvessupporting

confidence: 78%

Flux pinning force in bulkMgB2with variable grain size

et al. 2007

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We report temperature and magnetic-field dependence of flux pinning force in bulk MgB 2 with variable grain size. The samples are prepared by advanced methods, allowing minimizing effects of porosity, impurities, and inclusions of secondary phases. The effects of grain connectivity, flux-creep phenomena, and grain size on critical current density and flux pinning curves are analyzed. We have compared the field dependence of the pinning force for a range of samples with the predictions of theoretical models accounting for the effect of the grain size. There is qualitative agreement between grain-boundary pinning mechanism proposed by Hampshire and Jones ͓J. Phys. C 21, 419 ͑1987͔͒ and the experimentally observed grain-size dependence of pinning force in bulk MgB 2 .

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Section: Flux Pinning Curvessupporting

confidence: 78%

Flux pinning force in bulkMgB2with variable grain size

et al. 2007

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“…The f p curve of MB800 sample is fitted well with the function f p ∞ h p (1 − h) q , where p = 1.3 and q = 4.5. This behavior has been also observed by other groups in MgB 2 [15][16][17]. From the FWHM and SEM images, it is clear that the average grain sizes of MB750 and MB800 are comparably smaller than that of MB850 and MB900.…”

Section: Methodssupporting

confidence: 82%

Enhanced superconducting properties of bulk MgB2 prepared by in situ Powder-In-Sealed-Tube method

Varghese

Vinod

Rao

et al. 2009

Journal of Alloys and Compounds

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“…Several authors tried to circumvent this drawback using a series of the type with p i and q i from the Table 1 . Besides the fact that the physics beneath such a direct summation of different mechanisms is questionable, the exponents p i and q i proved to be different from those predicted in Table 1 12 , 13 . Ihara and Matsushita 14 proposed a Pythagorean summation for the associated critical current density when several types of pinning contribute.…”

Section: Introductionmentioning

confidence: 79%

On the pinning force in high density MgB2 samples

Sandu

Ionescu

Aldica

et al. 2021

Sci Rep

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An analysis of the field dependence of the pinning force in different, high density sintered samples of MgB2 is presented. The samples were chosen to be representative for pure MgB2, MgB2 with additives, and partially oriented massive samples. In some cases, the curves of pinning force versus magnetic field of the selected samples present peculiar profiles and application of the typical scaling procedures fails. Based on the percolation model, we show that most features of the field dependence of the critical force that generate dissipation comply with the Dew-Hughes scaling law predictions within the grain boundary pinning mechanism if a connecting factor related to the superconducting connection of the grains is used. The field dependence of the connecting function, which is dependent on the superconducting anisotropy, is the main factor that controls the boundary between dissipative and non-dissipative current transport in high magnetic field. Experimental data indicate that the connecting function is also dependent on the particular properties (e.g., the presence of slightly non-stoichiometric phases, defects, homogeneity, and others) of each sample and it has the form of a single or double peaked function in all investigated samples.

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Vortex dynamics in pure and SiC-doped MgB2

Cited by 21 publications

References 7 publications

Flux pinning force in bulkMgB2with variable grain size

Flux pinning force in bulkMgB2with variable grain size

Enhanced superconducting properties of bulk MgB2 prepared by in situ Powder-In-Sealed-Tube method

On the pinning force in high density MgB2 samples

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