Magnetic characterization of sintered MgB2 samples: effect of the substitution or doping with Li, Al and Si

Abstract

Powdered and sintered MgB2 samples have been characterized through magnetic measurements performed from T = 5 K up to few degrees above the transition temperature of about 39 K. We found that the sintered samples behave as well-connected bodies, showing no trace of granularity. In order to obtain the critical current density value Jc the Critical State Model has been therefore employed in a straightforward way. With the aim either to decrease the electron mean free path or to increase its Jc we have attempted to introduce defects in the MgB2 structure by different procedures: substitution of Lithium on the Magnesium site and doping of the precursor Boron powders with Aluminum and Silicon. The best result in terms of Jc has been achieved by Silicon doping that, moreover, does not significantly affect the transition temperature.

10 pages, 6 figures, 1 table

References in corpus (5)

• Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$
• Magnetoresistivity and Complete $H_{c2}(T)$ in $Mg{B}_2$
• Upper critical field and irreversibility line in superconducting MgB_2

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• Improvement of critical current density in Fe-sheathed MgB2 tapes by ZrSi2, ZrB2 and WSi2 doping
• Synthesis and search for superconductivity in LiBC
• High-pressure synthesis of pure and doped superconducting MgB2 compounds
• muSR study of carbon-doped MgB2 superconductors
• Correlated vortex pinning in Si-nanoparticle doped MgB2
• First-principle solubilities of alkali and alkaline earth metals in Mg-B alloys
• Nonlocal pure spin current injection via quantum pumping and crossed Andreev reflection
• Formation of MgB2 at low temperatures by reaction of Mg with B6Si
• Magnetoresistance and transistor-like behavior of double quantum dots connected to ferromagnetic and superconductor leads