✦ LIBER ✦

Angular reversibility and irreversibility of critical current in polycrystalline YBa2Cu3O7 wires

✍ Scribed by B.A Glowacki; J Jacklewicz; J.E Evetts

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 494 KB
Volume: 33
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(93)90082-y

No coin nor oath required. For personal study only.

✦ Synopsis

A detailed discussion of the influence of the rotation of Ag-YBa2Cu307 wires about their longitudinal axis in an external magnetic field on the critical current value is presented. In particular the angular dependence of the local field, defined as a superposition of the trapped flux and the externally induced magnetic flux, in superconducting rings (loops) and superconducting grains on the transport critical current paths has been computermodelled and analysed. Irreversibility of the Ic(~, B) function is observed for the rotation angle range from O to 7r. This behaviour is induced by the irreversibility of the screening current paths in the wire which occurs as a consequence of the readjustment of the local magnetic flux affecting the critical current of weak junctions. The shape of the Ic(co, B) function for further rotation of the wire matches the stable cyclic variation and is not irreversible.

📜 SIMILAR VOLUMES

Critical currents in polycrystalline YBa

Critical currents in polycrystalline YBa2Cu3O7−x

✍ T.R. Finlayson; D.A. Garvie; D.B. Lowe; Z. Przelozny; T.F. Smith 📂 Article 📅 1990 🏛 Elsevier Science 🌐 English ⚖ 557 KB

In this paper the critical density for a polycrystalline sample is calculated assuming a model of weakly coupled superconducting grains and the influence of grain size on the maximum tunnelling current is investigated. In addition the Josephson vortices are shown to be bound by the pinning force inh

Relation of critical current irreversibi

Relation of critical current irreversibility to trapped flux and microstructure in polycrystalline YBa2Cu3O7

✍ J.E. Evetts; B.A. Glowacki 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 905 KB

A study has been made of the cnt=cal current m silver clad YBa2Cu307 wires Detailed res=stwe trans,tlons, m zero magnetic field and w=th a magnet=c field apphed, indicate that below 10-3V m-1 these mater=als d~splay clear power law behawour of the form E=kl n w=th n values up to about 16 Th=s charac

Critical currents in bulk samples of YBa

Critical currents in bulk samples of YBa2Cu3O7−δ and DyBa2Cu3O7−δ

✍ J. Aponte; H. Abache; M. Octavio 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 363 KB

We have performed four probe transport measurements of the critical current in bulk samples of the high-Tc superconductors YBa2Cu307\_~ and DyBa2Cu3074. We found that over a range of temperatures the critical current varies linearly with (T c-T). This result indicates that these ceramics behave as a

Critical currents in YBa2Cu3O7−x + Ag th

Critical currents in YBa2Cu3O7−x + Ag thick films

✍ M.J Day; S.D Sutton; J.S Abell 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 568 KB

The influence of various processing parameters on the critical currents obtained in YBCO + Ag composite thick films has been investigated. These include the use of several precursor YBCO inks produced by different calcination procedures, the effect of both processing temperature and cooling rate, an

Magnetic field dependence of the relativ

Magnetic field dependence of the relative critical current density in γ-irradiated polycrystalline YBa2Cu3O7

✍ I. M. Obaidat; F. Hamed 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 132 KB

The effect of different doses of γ-rays on the behavior of the critical current density, J c in an YBa 2 Cu 3 O 7 polycrystalline sample has been investigated at high temperatures. The samples were irradiated at room temperature by a 60 Co γ-ray source at a dose rate of 0.5 MR/h. J c was found to in

Influence of fast neutron irradiation on

Influence of fast neutron irradiation on critical currents and irreversibility lines in MPMG-processed YBa2Cu3O7 superconductors

✍ M Wacenovsky; R Miletich; H.W Weber; M Murakami 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 595 KB

## Research Melt-powder melt-grown samples with different amounts of artificially introduced 211 particles were exposed to fast neutron irradiation up to a fluence of 4 x 1021 m -2 (E > 0.1 MeV). The influence of the irradiation on the critical current characteristics and on the irreversibility li