ac susceptibility in granular superconductors: theory and experiment

Kunold, A.; Hernandez, Maria Jose; Myszkowski, Andrzej; Cardoso, J. L.; Pereyra, Pedro

doi:10.1016/s0921-4534(01)00945-5

Cited by 20 publications

(11 citation statements)

References 35 publications

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“…On the other hand, the imaginary part 'χ ' of AC susceptibility is due to AC losses corresponding to the flux penetration into the grains boundaries. This part of AC susceptibility provides information about the flux pinning and the nature of weak links between the grains [20,21]. It is observed from these measurements on Cu 0.5 (Tl 0.5−y Hg y )-1234 samples that there is an increase in critical temperature and the magnitude of diamagnetic signal with the increase of Hg concentration up to y = 0.25.…”

Section: Resultsmentioning

confidence: 96%

“…AC susceptibility technique is very important for the study of superconductivity in granular samples. The real part of susceptibility (shielding effect) 'χ ' gives the bulk susceptibility due to superconductivity within the grains or intergranular regions [7,[21][22][23]. The suppression of superconductivity within the grains decreases the magnitude of χ .…”

Section: Resultsmentioning

confidence: 99%

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Enhanced superconducting properties of Cu0.5(Tl0.5−yHgy)Ba2Ca3Cu4O12−δ (y=0, 0.15, 0.25, 0.35) superconductor

Mumtaz

Khan

Khurram

2008

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Enhanced superconducting properties of Cu0.5(Tl0.5−yHgy)Ba2Ca3Cu4O12−δ (y=0, 0.15, 0.25, 0.35) superconductor

Mumtaz

Khan

Khurram

2008

Journal of Alloys and Compounds

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“…The elimination of these sources would increase the coupling between the grains and hence the transport properties of oxide superconductors. The weak links promote inferior transport properties in the compound [49][50][51]. The maximum transport current (in zero/non-zero external magnetic field) is an important parameter, which sets a criterion for the superconductor to be used for applications.…”

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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“…The elimination of these sources would increase the coupling between the grains and hence the transport properties of oxide superconductors. These weak links promote inferior transport properties in the compound [35][36][37]. The maximum transport current (in zero/nonzero external magnetic field) is an important parameter, which sets a criterion for the superconductor to be used for applications.…”

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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ac susceptibility in granular superconductors: theory and experiment

Cited by 20 publications

References 35 publications

Enhanced superconducting properties of Cu0.5(Tl0.5−yHgy)Ba2Ca3Cu4O12−δ (y=0, 0.15, 0.25, 0.35) superconductor

Enhanced superconducting properties of Cu0.5(Tl0.5−yHgy)Ba2Ca3Cu4O12−δ (y=0, 0.15, 0.25, 0.35) superconductor

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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