Sc substitution for Mg in MgB2: effects on Tc and Kohn anomaly

Details Sc substitution for Mg in MgB2: effects on Tc and Kohn anomaly Sc substitution for Mg in MgB2: effects on Tc and Kohn anomaly

2004-08-04

arxiv.org/abs/cond-mat/0408095v1

Phys. Rev. B 70, 134514 (2004)

Physics

Condensed Matter

Superconductivity

8 pages, 4 EPS figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.134514

Here we report synthesis and characterization of Mg_{1-x}Sc_{x}B_{2} (0.12T_{c}>6 K. We find that the Sc doping moves the chemical potential through the 2D/3D electronic topological transition (ETT) in the sigma band where the ``shape resonance" of interband pairing occurs. In the 3D regime beyond the ETT we observe a hardening of the E_{2g} Raman mode with a significant line-width narrowing due to suppression of the Kohn anomaly over the range 0

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