Here we report the synthesis and characterization of Mg1−xScxB2 (0.12<x<0.27) system, with critical temperature in the range of 30 K >Tc >6 K. We find that the Sc doping moves the chemical potential through the 2-D/3-D electronic topological transition (ETT) in the s band where the “shape resonance” of interband pairing occurs. In the 3-D regime beyond the ETT we observe a hardening of the E2g Raman mode with a significant line-width narrowing due to the suppression of the Kohn anomaly over the range 0<q<2kF.

Substitution of Sc for Mg in MgB2: Effects on transition temperature and Kohn anomaly

DE NEGRI, SERENA;GIOVANNINI, MAURO;SACCONE, ADRIANA;
2004-01-01

Abstract

Here we report the synthesis and characterization of Mg1−xScxB2 (0.12Tc >6 K. We find that the Sc doping moves the chemical potential through the 2-D/3-D electronic topological transition (ETT) in the s band where the “shape resonance” of interband pairing occurs. In the 3-D regime beyond the ETT we observe a hardening of the E2g Raman mode with a significant line-width narrowing due to the suppression of the Kohn anomaly over the range 0
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/245612
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