Structure Changes in Thermal and Fast Neutron Irradiated YBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt; and GdBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt;

Brezgunov, M.; Belogurov, S.; Petrov, A. E.; Карпов, А. В.; Kovalov, Viktor; Kudrenitskis, I.

doi:10.4028/www.scientific.net/msf.62-64.169

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“…It is also interesting to explore the possibilities of flux pinning enhancement in Li-doped materials following thermal neutron irradiation through the reaction products 3 H (2.73 MeV) and 4 He (2.05 MeV) [39]. In the particular case of GdBaCuO, because of large neutron capture cross section of 155 Gd and 157 Gd, thermal neutron irradiation can lead to the creation of defects different from those due to fast neutron induced cascades [40].…”

Section: Irradiation Effects In Htsc Materialsmentioning

confidence: 99%

Critical Current Limitations and Irradiation Effects in High-Temperature

et al. 1993

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The discovery of high-temperature superconductors stimulated many groups of researchers to study properties of these materials. From the basic point of view the most important problem is to clarify the mechanism of high-temperature superconductivity. From the practical point of view the most challenging task is to find mechanisms of strong pinning of the vortices, and thereby to obtain materials with high critical current density. The aim of this paper is to discuss problems connected with critical current limitations and to present possibilities which offer irradiation effects with respect to critical current enhancement.PACS numbers: 74.60.Ge, 74.60.Jg, 61.80.Hg MechaniSmS of critical current limitationsIn principle, there are three mechanisms which limit the critical current density, jc , in type II superconductors: depairing, decoupling, and depinning. DepairingDepairing critical current means a value of current for which the kinetic energy of supercurrent carriers is equal to the condensation energy in the superconducting state. In other words, for this value of current the superelectrons are excited over the superconducting gap and the Cooper pairs break up. According to the BCS theory the depairing critical current is inversely proportional to the coherence length ξ. In high temperature superconductors (IITSC), due to a very small value of Ę, this current is quite large (10 9 A/cm2 at low temperatures), therefore from the practical point of view this process is not the real limitation.(139)

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Section: Irradiation Effects In Htsc Materialsmentioning

confidence: 99%