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. Radiofrequency surface resistivity measurements has been used to obtain the variation of Tc with Sc doping. Increasing the Sc content, the exptl. Tc diverges from the Tc predicted by the BCS single band theory showing the key role of interchannel pairing near a shape resonance.
SC DOPING OF MGB2: THE STRUCTURAL AND ELECTRONIC PROPERTIES OF MG1-XSCXB2 / Agrestini, S; Metallo, C; Filippi, Matteo; Campi, G; Sanipoli, C; DE NEGRI, S; Giovannini, M; Saccone, A; Latini, Alessandro; Bianconi, Antonio. - In: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS. - ISSN 0022-3697. - 65:(2004), pp. 1479-1485. [10.1016/j.jpcs.2003.09.033]
SC DOPING OF MGB2: THE STRUCTURAL AND ELECTRONIC PROPERTIES OF MG1-XSCXB2
FILIPPI, Matteo;LATINI, ALESSANDRO;BIANCONI, Antonio
2004
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. Radiofrequency surface resistivity measurements has been used to obtain the variation of Tc with Sc doping. Increasing the Sc content, the exptl. Tc diverges from the Tc predicted by the BCS single band theory showing the key role of interchannel pairing near a shape resonance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
