Infrared properties of T'-phase R2CUO4 insulating compounds

Herr, S. L. and Kamarás, Katalin and Tanner, D. B. (1991) Infrared properties of T'-phase R2CUO4 insulating compounds. PHYSICAL REVIEW B CONDENSED MATTER, 43 (10). pp. 7847-7851. ISSN 0163-1829

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Abstract

Reflectance studies on single crystals of a series of rare-earth (R = Pr, Nd, Sm, Gd) copper oxides have been made to determine phonon frequencies as a function of rare-earth mass. The increase in interatomic force constants with increasing rare-earth mass, which leads to a reduction in the lattice parameters, increases the vibrational frequencies. In addition, the change from the T-phase La2CuO4 to the T'-phase R2CuO4 crystal structure causes changes in the phonon frequencies that are due both to the changing lattice parameters and to the relocation of the apical oxygen atoms.

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