On the correlation between order parameter, superconducting volume fraction and critical current density in R: 123 superconductors

Sedky, A.; Youssif, M.I.; Khalil, S.M.; Sawalha, Ayman Al

doi:10.1016/j.ssc.2006.05.017

Cited by 9 publications

(6 citation statements)

References 43 publications

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“…This means that the applied magnetic field is not sufficient to penetrate the intra-grains of superconductor, signifying good electrical contacts between the superconducting grains. These results are in agreement with those obtained by Sedky et al [34] for Re-123 superconductors and Awad et al [10] for Tl-1223 superconducting phase. It is observed that the inter-granular loss peak at p T slightly shifts to lower temperature by increasing the applied field due to losses associated with the motion of inter-granular Josephson tunneling.…”

Section: Resultssupporting

confidence: 93%

“…Also, The values of c ( ) J T are easily calculated over a wide range of temperature (70.2-77.2 K) in terms of the values of ( ) T  and c p ( ) J T as follows [34,37,38]:…”

Section: Resultsmentioning

confidence: 99%

“…While, the decrease in c J is attributed to the suppression of volume fractions of Gd-123 phase. Also, the excessive addition of nanosized CoFe 2 O 4 induces large agglomerations between the grains and not through the boundaries and voids, which deteriorates the inter-granular critical current density [34]. Clem and other workers [42,43] have described the principle of the separation of the contribution from grains and the coupling matrix.…”

Section: Resultsmentioning

confidence: 99%

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The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

et al. 2016

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Superconductor samples of type (CoFe 2 O 4 ) x GdBa 2 Cu 3 O 7δ (0≤x≤0.1) were synthesized by the conventional solid-state reaction technique, whereas nanosized CoFe 2 O 4 was prepared by co-precipitation method with grain size of about 8.5 nm. The elemental content of the prepared samples was determined using particle induced X-ray emission (PIXE). The temperature dependence of real (  ) and imaginary (  ) components of AC magnetic susceptibility (ACMS) at different magnetic field amplitude (3-15 Oe) was investigated. The analysis of the temperature dependence of ACMS was performed using Bean critical state model. The values of the critical current density c J at T > p T ( p T is the inter-granular loss peak temperature) were calculated as a function of magnetic field and nanosized CoFe 2 O 4 content. It was found that the low nanosized CoFe 2 O 4 addition content (x = 0.01) improves the critical current density c J of Gd-123 superconducting phase. The observed variation of c J with temperature indicated that the weak links are changed from superconductornormal metal-superconductor (SNS) for free sample to superconductor-insulator-superconductor (SIS) type of junctions for samples added with nanosized CoFe 2 O 4 of x > 0.01. We also discussed the experimental results in the framework of the critical state model to estimate the effective volume fraction of the grains g f using Cole-Cole plots.

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Section: Resultssupporting

confidence: 93%

“…Also, The values of c ( ) J T are easily calculated over a wide range of temperature (70.2-77.2 K) in terms of the values of ( ) T  and c p ( ) J T as follows [34,37,38]:…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

et al. 2016

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“…The imaginary part of magnetic ac-susceptibility χ ′′ measures the hysteresis losses due to eddy currents through the inter-grain weak links. The peak of χ ′′ in a superconductor with weakly connected grains appeared at lower temperatures as compared to the sample with strongly coupled grains [53]. The sharpness of the peak in χ ′′ reflects the strong intergrain coupling, flux pinning and higher J c in the samples [54,55].…”

Section: Resultsmentioning

confidence: 99%

Homogeneous distribution of carriers in the conducting planes by Zn substitution at Cu sites in Cu0.5Tl0.5Ba2Ca3Cu4O12−δ superconductors

Mumtaz

Khan

2010

Low Temperature Physics

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The effect of suppression of antiferromagnetic order and charge stripes formation mechanism, by Zn3d 10 (S = 0) substitution at Cu3d 9 (S = 1/2) sites in CuO 2 planes of Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12-δ , on superconductivity parameters is demonstrated. If antiferromagnetism and charge stripes have some role in bringing about superconductivity at a particular temperature, the doping of nonmagnetic Zn impurity would destroy it and hence the superconductivity. However we have observed enhanced superconducting properties with the increase of Zn doping in Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4 O 12-δ superconductor. The decreased c-axis length with the increase of Zn doping improves interlayer coupling and hence the three-dimensional conductivity in the unit cell. The role of charge carriers in CuO 2 planes of Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4-y Zn y O 12-δ in bringing about superconductivity has also been explained. PACS: 74.70.-b Superconducting materials other than cuprates; 74.62.Bf Effects of material synthesis, crystal structure, and chemical composition; 74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses). Keywords: Cu 0.5 Tl 0.5 Ba 2 Ca 3 Cu 4-y Zn y O 12-δ superconductors, antiferromagnetism, charge stripes, charge carriers.

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“…A sharp transition observed in the diamagnetic signal with the increased Zn substitution has suggested enhanced phase purity in the final compound [12][13][14][15][16][17][18][19][20][21]. The increase in the volume fraction of superconductivity is most likely linked with the enhancement in the coherence length along the c-axis and homogeneous distribution of carriers in various conducting planes [29,30,[38][39][40]. Our results strongly suggested that the charge carriers in the conducting CuO 2 /ZnO 2 planes play a decisive role in the mechanism of superconductivity in Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3− y Zn y O 10−δ superconductors and these carriers are supplied by the ratio of Cu +2 /Tl +3 and oxygen content in the Cu 0.5 Tl 0.5 Ba 2 O 4−δ charge reservoir layers [19,20].…”

Section: Resultsmentioning

confidence: 99%

Improvement of superconductivity with the reduced anti-ferromagnetism in Zn-doped CuTl-1223 superconductors

Mumtaz¹,

Khan²

2009

Phys. Scr.

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The effect of suppression of anti-ferromagnetic order with the substitution of Zn 3d 10 (S = 0) at Cu 3d 9 (S = 1/2) sites in CuO 2 planes of Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3 O 10−δ (CuTl-1223) superconductors has been discussed. It has been demonstrated from the comparison of our results with the previously published data that Zn doping suppresses anti-ferromagnetism and enhances superconductivity. The decreased c-axis length with the increased Zn doping has been found to improve the interplane coupling and hence enhance the three-dimensional (3D) conductivity in the unit cell. The role of charge carriers in CuO 2 planes of Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3− y Zn y O 10−δ in bringing about superconductivity has also been explained.

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On the correlation between order parameter, superconducting volume fraction and critical current density in R: 123 superconductors

Cited by 9 publications

References 43 publications

The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

Homogeneous distribution of carriers in the conducting planes by Zn substitution at Cu sites in Cu0.5Tl0.5Ba2Ca3Cu4O12−δ superconductors

Improvement of superconductivity with the reduced anti-ferromagnetism in Zn-doped CuTl-1223 superconductors

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