Faculté des sciences

Enhanced superconducting properties of Eu₂O₃-doped MgB₂

Ojha, N. ; Malik, Vivek Kumar ; Bernhard, Christian ; Varma, G.D.

In: Physica C: Superconductivity, 2009, vol. 469, no. 14, p. 846-851

Bulk polycrystalline samples of Eu₂O₃-doped MgB₂ have been synthesized by a standard solid state reaction route and their structural and superconducting properties have been investigated. As a function of Eu₂O₃ content we have found a significant increase in the critical current density (Jc) and the irreversibility field (Hirr) in the magnetic field... Plus

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    Summary
    Bulk polycrystalline samples of Eu₂O₃-doped MgB₂ have been synthesized by a standard solid state reaction route and their structural and superconducting properties have been investigated. As a function of Eu₂O₃ content we have found a significant increase in the critical current density (Jc) and the irreversibility field (Hirr) in the magnetic field range 0–6 T. The XRD results reveal the presence of MgO and EuB₆ secondary phases along with the main hexagonal phase of MgB₂. The strain values and the lattice distortions have been found to increase almost linearly with the nominal Eu₂O₃ content. The observed significant improvement in Jc(H) and Hirr in the Eu₂O₃-doped MgB₂ samples, thus is mainly attributed to the lattice distortions introduced by Eu₂O₃ doping.