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We report the boron isotope effect on the E2g phonon mode by micro-Ramanspectroscopy on the ternary Mg1-xAlxB2 system, synthesized with pure isotopes10B and 11B. The isotope coefficient on the phonon frequency is near 0.5 in thefull range decreasing near x = 0. The intraband electron-phonon (e-ph)coupling, for the electrons in the sigma band, has been extracted from the E2gline-width and frequency softening. Tuning the Fermi energy near the electronictopological transition (ETT), where the sigma Fermi surface changes from 2D to3D topology the E2g mode, shows the known Kohn anomaly on the 2D side of theETT and a splitting of the E2g phonon frequency into a hard and soft componentfrom x = 0 to x = 0.28. The results suggest a minor role of the intrabandphonon mediated pairing in the control of the high critical temperature inMg1-xAlxB2. The common physical features of diborides with the novel multigapFeAs-based superconductors and cuprates is discussed.

Isotope effect on the E2g phonon and mesoscopic phase separation near the electronic topological transition in Mg1-xAlxB2