• SONAMUTHU. K
• GEENA VIDYA . S

Even though a fairly good amount of literature is available on the vibrational spectra of high temperature superconductors, still some specific feature in the experimental vibration spectra could not be assigned reliable to a definite type of vibration. Hence a normal coordinate analysis (NCA) which is applicable to zero wave-vector normal-mode vibrations have been carried out for the high temperature superconductors and the assignment of specific features like phonon softening and hardening were looked in for the clear understanding of the superconducting mechanism in these new class materials. In the normal coordinate analysis, PED play an important role for characterization of the relative contributions from each internal coordinate to the total potential energy associated with particular normal coordinate of the molecule. The contribution to the potential energy from the individual diagonal elements give rise to a conceptual link between the empirical analysis of infrared spectra of complex molecules dealing with characteristic group frequencies and the theoretical approach from the computation of the normal modes. NCA gives complete assessment of all normal vibration modes of the system.

High Temperature Superconductor Conductor (HTSC), NCA, Raman and IR-spectroscopy, Brillouin zone, Potential Energy Distribution (PED), etc.,

"Normal CO-Ordinate Analysis Of HTSC La2CuO4.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 3, page no.a77-a84, March-2024, Available :http://www.jetir.org/papers/JETIR2403012.pdf

"Normal CO-Ordinate Analysis Of HTSC La2CuO4.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 3, page no. ppa77-a84, March-2024, Available at : http://www.jetir.org/papers/JETIR2403012.pdf