Neutron inelastic scattering measurements have been performed on superconducting MgB2 above and below Tc. The temperature dependence of the generalized phonon density-of-states showed clear anomalous behaviour near 24 meV in the acoustic phonon region, which may be interpreted as evidence of a substantial contribution to the total electron-phonon coupling strength deriving from these phonons. Weaker evidence for a corresponding response in the high-energy B bond stretching phonons was also encountered.
ASJC Scopus subject areas
- Physics and Astronomy(all)