Lattice dynamics and normal coordinate analysis of HTSC Tl2CaBa2Cu2O8

摘要

The lattice dynamics of the high-temperature superconductor Tl2CaBa2CU2O8 has been investigated on the basis of the three-body-force shell model (TSM). The various interactions between ions are treated in a general way without making them numerically equal. The phonon frequency at the zone centre of Brillouin zone are presented and the vibrational assignments are discussed. Further, a normal coordinate calculation has also been employed to study the vibrational analysis of this compound. The normal coordinate analysis of the superconductor Tl2CaBa2CU2O8 has been calculated by using Wilson's F-G matrix method which is useful for the confirmation of our present investigation. The vibrational frequencies and the potential energy distribution (PED) of the optically active phonon modes are also presented. [References: 10]