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Lattice Dynamics and Normal Coordinate Analysis of HTSC Tl 2 CaBa 2 Cu 2 O 8
Author(s) -
Mohan S.,
Sonamuthu K.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200202)229:3<1121::aid-pssb1121>3.0.co;2-h
Subject(s) - brillouin zone , phonon , lattice (music) , superconductivity , condensed matter physics , normal mode , shell model , physics , coordinate system , ion , molecular physics , atomic physics , vibration , quantum mechanics , geometry , mathematics , acoustics
Abstract The lattice dynamics of the high‐temperature superconductor Tl 2 CaBa 2 Cu 2 O 8 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 Tl 2 CaBa 2 Cu 2 O 8 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.