Micro-Raman scattering investigation of MgB2 and RB2 (R=Al, Mn, Nb and Ti)

N. Ogita, T. Kariya, K. Hiraoka +5

Phonon spectra have been investigated by micro-Raman scattering from 290 to 20K. New peaks at 500 and 674 cm-1 appear below 250K in MgB2. These peaks are explained by the Fermi res…