Airy pattern, weak-link modeling of critical currents in high-Tc superconductors

Peterson, Robert L.; Ekin, John W.

doi:10.1016/0921-4534(89)90023-3

Cited by 151 publications

(31 citation statements)

References 11 publications

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“…The is controlled by the weak links between superconducting grains in the low field regime. At higher fields 0.03 T , the behavior is mainly governed by flux pinning for , but by both flux pinning and grain alignment for [19], [20]. It means the Bi-2223 grain connectivity and grain alignment in tape T-2 has been improved through optimizing the phase assemblage of precursor powders.…”

Section: Resultsmentioning

confidence: 96%

Kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by various calcined powders

Jiang¹,

Yoo²,

et al. 2003

IEEE Trans. Appl. Supercond.

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The kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by precursor powders with different phase assemblages have been studied. Our results show that the formation process of 2223 phase is strongly related to the secondary phases in precursors. A variation of the reaction-order, , deduced from the Avrami relation, was observed along with the whole sintering processing. Within a sintering period of 65 h, keeps the value of 0.7 for the tape made from the powder calcined at 830 C, while it changes from 0.3 or 0.4 to 1 for the tapes prepared with the powders calcined at 810 C and 820 C. Based on the analysis of phase formation and transport properties, the optimum calcination conditions for achieving high tapes are discussed.

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Section: Resultsmentioning

confidence: 96%

Kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by various calcined powders

Jiang¹,

Yoo²,

et al. 2003

IEEE Trans. Appl. Supercond.

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“…The critical current density for the virgin curve drops steeply with increasing field. This is a typical behavior for the ceramic bulk superconductors and has been given a detailed analysis by Peterson and Ekin [6]. The value of J c noticeably differs from the virgin curve by increasing as the field sweeps in the decreasing direction.…”

Section: (T)mentioning

confidence: 99%

“…Transport critical current densities of bulk ceramic high T c superconductors have generally been restricted to values approximately 10 3 A/cm 2 at 77 K in self-field because of weak intergranular current transfer. The critical current density J c (B) has been elucidated by a model consisting of strongly superconducting grains joined by Josephson junctions [6]. In small magnetic fields critical current densities of bulk samples are rapidly depressed to values less than 10 A/cm 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of pelletization pressure on structural properties and critical current hysteresis of ceramic superconducting Bi1.7Pb0.3Sr2Ca2Cu3Oy

Tepe

Avci

Abukay

2003

phys. stat. sol. (a)

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The effect of pelletization pressures on structural properties and critical current hysteresis of Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O y samples was investigated. The samples used in this study were prepared by classical solid-state reaction at the pressures from 100 up to 500 MPa. The obtained samples were characterized by resistance vs. temperature, (R-T), critical current density vs. applied magnetic field, (J c -H), material density vs. pressure, (ρ -P), XRD, SEM, and EDAX. The results of this study showed that the quality of electrical and structural properties of Bi-2223 bulk superconductors strongly depends on the pelletization pressure. Pressing of bulk samples at 400 MPa produces textured grain alignment and associates microstructural modifications in order to enhance flux pinning and thus increases current carrying capacities.

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“…Eq. (19) generalizes the so called Airy pattern of a circular junction 1 ; it was first reported by Peterson et al 2 in 1990 and has been recently recalculated using a different approach 15 .…”

Section: The Mdp Of Superelliptic Josephson Tunnel Junctionsmentioning

confidence: 99%

Superelliptic Josephson Tunnel Junctions

Monaco

2017

J Low Temp Phys

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The most important practical characteristic of a Josephson junction is its critical current. The shape of the junction determines the specific form of the magnetic-field dependence of the its Josephson current.Here we address the magnetic diffraction patterns of specially shaped planar Josephson tunnel junctions. We focus on a wide ensemble of generalized ellipses, called superellipses, which retain the second order symmetry. We analyze the implications of this type of isometry and derive the explicit expressions for the threshold curves of superelliptic Josephson junctions. A detailed study is made of their magnetic patterns with emphasis on the rate of decay of the sidelobes amplitudes for large field amplitudes.

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Airy pattern, weak-link modeling of critical currents in high-Tc superconductors

Cited by 151 publications

References 11 publications

Kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by various calcined powders

Kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by various calcined powders

Effect of pelletization pressure on structural properties and critical current hysteresis of ceramic superconducting Bi1.7Pb0.3Sr2Ca2Cu3Oy

Superelliptic Josephson Tunnel Junctions

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