PHONON-SPECTRUM AND LATTICE SPECIFIC-HEAT OF THE HGBA2CUO4 HIGH-TEMPERATURE SUPERCONDUCTOR

The phonon density of states and lattice specific heat have been calcu lated for the HgBa2CuO4 high-temperature superconducting compound for the first time by using a simple lattice dynamical model theory, namel y the rigid ion model. The obtained results show an overall consistent description of the lattice dynamics of this compound, However, we cou ld not compare our results with experimentally measured values as they are not available so far, We emphasize that the neutron scattering an d specific heat measurements justify our results, However, we expect t hat there will be not much difference as the present model has been qu ite successful in explaining the pressure dependence of the Raman acti ve phonon modes for this compound [14,15].