AC susceptibility of high Tc superconductor Tl0.8Pb0.2Bi0.2Sr1.6Ba0.4Ca2Cu3Ox using a critical state model

Lee, J.H.; Kim, Y.C.; Kim, B.J.; Jeong, Dae-Yong

doi:10.1016/s0921-4534(00)01567-7

Cited by 23 publications

(6 citation statements)

References 19 publications

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“…In particular the loss component of the AC susceptibility has been used widely to probe the nature of weak links in polycrystalline superconductors. It is also employed to estimate some of the important physical properties like critical current density Jc and effective volume fraction of the superconducting grains [10][11][12][13]. Several critical state models have been very successful in accounting for major features of the temperature and field variation of AC susceptibility [14][15][16].…”

Section: Resultsmentioning

confidence: 99%

Effect of deoxygenation on the weak-link behavior of YBa2Cu3O7−δ superconductors

Salamati

Kameli

2003

Solid State Communications

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A systematic study of the weak-link behavior for YBa 2 Cu 3 O 7-δ polycrystalline samples has been done using the electrical resistivity and AC susceptibility techniques.The experiments were performed with two samples of similar grain, a sample of wellcoupled grains, and a deoxygenated sample in such a way that the oxygen mostly come from the intergrain region. Analysis of the temperature dependence of the AC susceptibility near the transition temperature (Tc) has been done employing Bean's critical state model. The observed variation of intergranular critical current densities(Jc) with temperature indicates that the weak links are changed from superconductor-normal metal-superconductor (SNS) for well-coupled sample to superconductor-insulatornormal metal superconductor(SINS) type of junctions for the deoxygenated sample.These results are interpreted in terms of oxygen depletion from grain boundaries, which in turn decreases the intergranular Josephson coupling energy with a consequent decrease of pinning of the intergranular vortices.

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Section: Resultsmentioning

confidence: 99%

Effect of deoxygenation on the weak-link behavior of YBa2Cu3O7−δ superconductors

Salamati

Kameli

2003

Solid State Communications

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“…It is also employed to estimate some of the important physical parameters like critical current density, J c , and effective volume fraction of the superconducting grains, f g . [28][29][30][31][32][33] Experimentally, the real part of AC susceptibility, 0 , in polycrystalline samples shows two drops as the temperature is lowered below onset of diamagnetic transition and correspondingly the derivative of the 0 ðTÞ displays two peaks. The first sharp drop at T c is due to the transition within grains and the second gradual change at T cJ is due to the occurrence of the weak link network between grains.…”

Section: Characterization Of Sintered Samplesmentioning

confidence: 99%

“…The first sharp drop at T c is due to the transition within grains and the second gradual change at T cJ is due to the occurrence of the weak link network between grains. [34][35][36] The imaginary part, 00 , shows a peak which is the sign of the dissipation in the sample.…”

Section: Characterization Of Sintered Samplesmentioning

confidence: 99%

The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y Superconductors

Abdolhosseini¹,

Kameli²,

Salamati³

2008

jjap

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We have studied the effect of precursor powder size on the microstructure and intergranular behavior of polycrystalline (Bi,Pb)2Sr2Ca2Cu3Oy (Bi-2223) superconductors, using the X-ray powder diffraction (XRD), scanning electron microscope (SEM), electrical resistivity, and AC susceptibility techniques. Polycrystalline Bi-2223 superconductors were prepared from the powders with different milling times. The XRD results show that by decreasing precursor powder size, the Bi-2223 phase fraction increases in sintered samples. It was found that the grain size and grain connectivity improved by decreasing precursor powder size. The analysis of temperature dependence of AC susceptibility near the transition temperature (Tc) indicates that, by decreasing the precursor powder size in the Bi-2223 system, the intergranular critical current density increases. We have estimated the effective volume fraction of the grains in the framework of the Critical State Model based on our experimental results. This estimation shows, the effective volume of the grains increases by decreasing precursor powder size.

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“…As it is evident from this picture, there are two distinctive regions. Namely, above h = 15Oe the curves exhibit almost linear dependence which can be attributed to establishment of the well-documented [18,19,20,21] Bean type critical state regime with 1+4πχ ′ B (h) = 2h/J C D where J C is the fieldindependent critical current density and D the sample's thickness. On the other hand, below h = 15Oe, practically temperature-independent periodic oscillations are clearly seen.…”

Section: Resultsmentioning

confidence: 86%

Unusually strong coherent response from grain-boundary Josephson network in polycrystalline Pr x Y1 − x Ba2Cu3O7 − δ

et al. 2009

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By applying a highly sensitive homemade AC susceptibility technique to P rxY1−xBa2Cu3O 7−δ polycrystals (with x = 0.0, 0.1 and 0.3), we observed very sharp Fraunhofer type low-field periodic oscillations of the real part of the AC susceptibility which were attributed to Josephson vortices penetrating intergranular regions of grain-boundary Josephson network in our samples. Assuming the Lorentz type distribution of single-junction contact areas, we were able to successfully fit the experimental data.

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AC susceptibility of high Tc superconductor Tl0.8Pb0.2Bi0.2Sr1.6Ba0.4Ca2Cu3Ox using a critical state model

Cited by 23 publications

References 19 publications

Effect of deoxygenation on the weak-link behavior of YBa2Cu3O7−δ superconductors

Effect of deoxygenation on the weak-link behavior of YBa2Cu3O7−δ superconductors

The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y Superconductors

Unusually strong coherent response from grain-boundary Josephson network in polycrystalline Pr x Y1 − x Ba2Cu3O7 − δ

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AC susceptibility of high Tc superconductor Tl0.8Pb0.2Bi0.2Sr1.6Ba0.4Ca2Cu3Ox using a critical state model

Cited by 23 publications

References 19 publications

Effect of deoxygenation on the weak-link behavior of YBa2Cu3O7−δ superconductors

Effect of deoxygenation on the weak-link behavior of YBa2Cu3O7−δ superconductors

The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)2Sr2Ca2Cu3Oy Superconductors

Unusually strong coherent response from grain-boundary Josephson network in polycrystalline Pr x Y1 − x Ba2Cu3O7 − δ

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The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y Superconductors