Here we report synthesis and characterization of Mg1−xScxB2 (0.12Tc>6 K. We find that the Sc doping moves the chemical potential through the 2D/3D electronic topological transition (ETT) in the σ band where the "shape resonance" of interband pairing occurs. In the 3D regime beyond the ETT we observe a hardening of the E2g Raman mode with a significant line-width narrowing due to suppression of the Kohn anomaly over the range 0
We have synthesized superconducting Mg 1-x Sc x B 2 ternary system in order to explore the influence of electron doping on the electronic properties. An accurate characterization of several samples by X-ray diffraction and conductance measurements has been performed. The T c vanishes at the critical concentration x at which the Fermi level is tuned to the top of the σ band. Sc doping in Mg 1-x Sc x B 2 allows to tune the Fermi level to the "shape resonance" of the σ boron superlattice with negligible changes of the lattice and we have found a large T c amplification by approaching the "shape resonance" as predicted by our previous works.
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