Author/Authors :
S Agrestini، نويسنده , , C Metallo، نويسنده , , M Filippi، نويسنده , , G Campi، نويسنده , , C. Sanipoli، نويسنده , , S De Negri، نويسنده , , M Giovannini، نويسنده , , A Saccone، نويسنده , , A Latini، نويسنده , , A Bianconi، نويسنده ,
Abstract :
We have investigated the effect of electron doping on the superconducting properties of MgB2. For the purpose we have synthesized several samples along the Mg1−xScxB2 section. The X-ray diffraction measurements reveal small changes in the lattice parameters suggesting that the Sc doping could be considered to simply fill the boron σ bands. Radio frequency surface resistivity measurements has been used to obtain the variation of Tc with Sc doping. Increasing the Sc content, the experimental Tc diverges from the Tc predicted by the BCS single band theory showing the key role of interchannel pairing near a shape resonance.
