c-axis Raman Scattering in MgB2: Observation of a Dirty-Limit Gap in the pi-bands

J. W. Quilty, S. Lee, S. Tajima +1

Raman scattering spectra from the ac-face of thick MgB2 single crystals were measured in zz, xz and xx polarisations. In zz and xz polarisations a threshold at around 29 cm^{-1} fo…