Optically active vibrations of lanthanum copper oxide compound (La2CuO4)

✍ Scribed by Ken Ohwada

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 583 KB
• Volume: 45
• Category: Article
• ISSN: 1386-1425
• DOI: 10.1016/0584-8539(89)80192-8

✦ Synopsis

Normal coordinate

analysis of the optically active vibrations of lanthanum copper oxide has been made, with the assumption of a perovskite K,NiF, structural model. On the basis of the results of this treatment, all of the observed bands so far reported have been successfully assigned to the intramolecular Cu-0 vibrations and the optically active lattice vibrations (the motions of La against CuO, octahedra, abbreviated to La---CuO,). The force constants concerning Cu-0 and La-O bonds have been obtained within the framework of the modified valence force fields. It has been found that the present normal coordinate analysis based on a whole crystal is useful for assigning the optically active vibrations (normal modes) at the center of the Brillouin zone in La,CuO,.