Pregled bibliografske jedinice broj: 153779
Vortex pinning by correlated disorder in nanoparticle doped MgB_2
Vortex pinning by correlated disorder in nanoparticle doped MgB_2 // 2004 International Cryogenic Materials Conference (ICMC) topical workshop / Dou, Shi Xue (ur.).
Wollongong, 2004. str. 36-36 (poster, međunarodna recenzija, sažetak, znanstveni)
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Naslov
Vortex pinning by correlated disorder in nanoparticle doped MgB_2
Autori
Kušević, Ivica ; Babić, Emil ; Husnjak, Ozren ; Soltanian, Saeid ; Wang, Xiaolin ; Dou, Shi Xue
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
2004 International Cryogenic Materials Conference (ICMC) topical workshop
/ Dou, Shi Xue - Wollongong, 2004, 36-36
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
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
vortex pinning; MgB_2
Sažetak
The magnetoresistivity and critical current density of five Si-nanoparticle doped ($c\leq 10$ wt\%) and undoped Cu-sheathed MgB$_{;2};$ tapes and wires have been measured for temperatures $T\geq 28$ K in magnetic fields $B\leq 0.95$ T. The irreversibility lines $B_{;irr}; (T)$ for doped tapes show a change in a slope of the temperature variation with a crossover field depending on Si-content. Such $B_{;irr}; (T)$ variation is typical for high-temperature superconductors (HTS) containing columnar defects (a crossover occurs around the matching field $B_{;\phi };$) and is very different from a smooth $B_{;irr}; (T)$ variation in undoped MgB$_{;2}; $ samples. However, in nanoparticle doped MgB$_{;2}; $, the enhancement of $B_{;irr}; $ with respect to that of the undoped one, persists at all field scales (including $% B\gg B_{;\phi }; $), which is not the case in HTS containing columnar defects. The microstructure studies of nanoparticle doped MgB$_{;2}; $ samples show uniformly dispersed Mg$_{;2}; $Si nanopercipitates, which probably act as a correlated disorder. The observed difference between the field variations of the critical current density and pinning force density of the doped and undoped samples support the above findings. The impact of these results for a further enhancement of flux pinning and critical currents in MgB$_{;2}; $ is briefly discussed.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
