Raman mode assignments of HgBa2CuO4+ crystallites

Phonon dispersion in the one-layer cuprate HgBa2CuO4+

“…In table 2 the calculated Raman shift frequencies for the four Raman active modes together with the experimental ones as found by Zhou et al (1996b) are reported (other Raman measurements, as Krantz et al 1994, Lee et al 1994, Poulakis et al 1999and Cai et al 2001 Table 1.…”

“…Such a size is insufficient for inelastic neutron scattering (INS), that is the standard technique used to measure the dispersion of phonons. For this reason, phonon data on this system were, up to now, limited to the ones obtained by INS performed on powders, which gives a measure of the phonon density of state (PDOS) (Renker et al 1996), and by Raman spectroscopy (Hur et al 1993, Krantz et al 1994, Lee et al 1994, Ren et al 1994, Yang et al 1995, Zhou et al 1996a, Poulakis et al 1999and Cai et al 2001. These experimental results have been analysed using a shell model calculation by Renker et al (1996) and Stachiotti et al (1995), who have also determined the zone centre frequencies from frozen-phonon first principles calculations.…”