Strong flux pinning in nano-SiC doped MgB2 wires (CROSBI ID 522663)
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Podaci o odgovornosti
Husnjak, Ozren ; Kušević, Ivica ; Babić, Emil ; Soltanian, Saeid ; Wang, Xiao Lin ; Dou, Shi Xue
engleski
Strong flux pinning in nano-SiC doped MgB2 wires
Irreversibility fields Birr and critical current densities Jc of undoped and doped (10 wt.% SiC) MgB2/Cu tapes and MgB2/Fe wires were measured from 2 K up to 38 K in magnetic field B<=16 T. For B>=1 T, Birr(T) variation for all samples is similar, but Birr of MgB2/Fe is higher than that of corresponding MgB2/Cu tapes. However, the enhancement of Birr upon doping, Birr(dop.)/Birr(undop.)~1.4 is the same for both types of samples indicating the same pinning mechanism. Birr of doped MgB2/Fe wire reaches that of optimised NbTi wires (10 T, 4.2 K) already at 20 K and extrapolates to 21 T at 4.2 K (close to that of Nb3Sn). In spite of low core density (~1.2 g/cm3) Jc of doped MgB2/Fe wire is high and decreases little with magnetic field: Jc(4.2 K)=19 kA/cm2 in B=13 T which yields FP=JcB=2.5 GN/m3. Since Jc and Jc-B variation in our samples is limited by core porosity and defects (cracks and voids), the Jc and FP values for more dense and homogeneous SiC doped samples are probably several times larger.
MgB2; Superconductor; Irreversibility field; Critical current density; Nanostructured
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Podaci o prilogu
102-102-x.
2006.
objavljeno
Podaci o matičnoj publikaciji
M2S-HTSC VIII Abstract Booklet
Dresden:
Podaci o skupu
8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors
poster
09.07.2006-14.07.2006
Dresden, Njemačka