Pregled bibliografske jedinice broj: 153781
Vortex pinning and critical currents in nanostructured novel superconductors
Vortex pinning and critical currents in nanostructured novel superconductors // 2004 International Cryogenic Materials Conference (ICMC) topical workshop / Dou, Shi Xue (ur.).
Wollongong, 2004. str. 29-29 (pozvano predavanje, međunarodna recenzija, sažetak, znanstveni)
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Naslov
Vortex pinning and critical currents in nanostructured novel superconductors
Autori
Kušević, Ivica ; Babić, Emil
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
2004 International Cryogenic Materials Conference (ICMC) topical workshop
/ Dou, Shi Xue - Wollongong, 2004, 29-29
Skup
2004 International Cryogenic Materials Conference (ICMC) topical workshop: Materials Processing, Microstructures and Critical Current of Superconductors
Mjesto i datum
Wollongong, Australija, 10.02.2004. - 13.02.2004
Vrsta sudjelovanja
Pozvano predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
vortex pinning; Bi2223/Ag superconductor; MgB2
Sažetak
Systematic analysis of the parameters associated with vortex pinning in novel superconductors containing nano-scale strong isotropic pinning centres (such as U/n processed Bi2223/Ag tapes and nanoparticle added MgB$_{; ; 2}; ; $ has been carried out. Although the systems studied are very different as regards their structures, types of nano-scale defects and vortices, their pinning parameters (irreversibility fields and the fields for the maximum-volume pinning force) show distinct common features, which do not depend on the actual measurement method (transport vs. magnetic). In particular, in all these systems the enhancement of the pinning parameters in nanostructured state is, for moderate defect densities $n_{; ; \phi }; ; $, approximately linear in $n_{; ; \phi }; ; $ over sizable field and temperature windows. Accordingly, these systems exhibit a kind of matching effects with the effective matching field $B_{; ; \phi }; ; $, correlated with the areal density of defects. This field $% B_{; ; \phi }; ; $ forms a natural field scale for the vortex pinning phenomena in such superconductors. However, at fields far from $B_{; ; \phi }; ; $, an interplay of different pinning mechanisms sets in. The impact of these results for the future enhancement of the flux pinning and critical currents in nanostructured Bi2223 and MgB$_{; ; 2}; ; $ superconductors is briefly discussed.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
