NDLI: Nano Fe$_{3}$O$_{4}$ Induced Fluxoid Jumps and Low Field Enhanced Critical Current Density in MgB$

Content Provider	Springer Nature Link
Author	Singh, K. P. Awana, V. P. S. Balamurugan, S. Shahabuddin, M. Singh, H. K. Husain, M. Kishan, H. Bauminger, E. R. Felner, I.
Copyright Year	2007
Abstract	Nano particle of Fe$_{3}$O$_{4}$ (nFe$_{3}$O$_{4}$) up to 6 at% were doped in the superconducting MgB$_{2}$ samples. Despite the strong ferromagnetic nature of Fe$_{3}$O$_{4}$, both the ac susceptibility and the resistivity measurements show that up to 4 at% of Fe$_{3}$O$_{4}$, T $_{ c }$=38 K is not changed, whereas for 6% T $_{ c }$ decreases by 6 K. This indicates that a low concentration of Fe does not substitute either the Mg or B sites and probably occupies the intergrain spaces. For 0.5% doped Fe$_{3}$O$_{4}$, an increase in J $_{ c }$ with respect to the pure MgB$_{2}$ samples is observed in the lower field and temperature regions (H<2 T and 20 K) indicating an enhanced flux pinning and the magnetic activation, i.e., the interaction between the magnetic dipole of Fe ion and the vortices is weak in comparison to the effective pinning potential. Whereas, at H>2 T, J $_{ c }$ of the doped samples is always less than that of MgB$_{2}$, and the activation is dominant in comparison with the effective pinning potential provided by the doping. Flux jumps are observed in lower T and H regions for the samples doped up to 1% nFe$_{3}$O$_{4}$ only. Magnetization plots of higher Fe content samples exhibited clear paramagnetic background. Mossbauer measurements for the higher (4, 6 at%) nFe$_{3}$O$_{4}$ doped MgB$_{2}$ samples show that at RT, the hyperfine field for both samples is ∼100 kOe and ∼120 kOe at 90 K. This means that the nFe$_{3}$O$_{4}$ particles decompose and form possibly an intermetallic Fe-B phase in the matrix.
Starting Page	39
Ending Page	44
Page Count	6
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	21
Issue Number	1
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2007-09-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MgB$_{2}$ Vacuum synthesis Nano-Fe$_{3}$O$_{4}$ Critical current density Characterization and Evaluation of Materials Condensed Matter Magnetism, Magnetic Materials Superconductivity, Superfluidity, Quantum Fluids
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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