Polarized far-infrared and Raman spectra of Bi<sub>2</sub>CuO<sub>4</sub> single crystals
Z V Popovic; G Kliche; M J Konstantinovic; A Revcolevschi; Z V Popovic; Inst. of Phys., Belgrade, Yugoslavia; G Kliche; Inst. of Phys., Belgrade, Yugoslavia; M J Konstantinovic; Inst. of Phys., Belgrade, Yugoslavia; A Revcolevschi; Inst. of Phys., Belgrade, Yugoslavia
Журнал:
Journal of Physics: Condensed Matter
Дата:
1992-12-07
Аннотация:
The authors present the polarized far-infrared and Raman spectra of Bi<sub>2</sub>CuO<sub>4</sub> single crystals at 300 and 10 K in the spectral range from 30 to 650 cm<sup>-1</sup>. All infrared-active modes (10E<sub>u</sub>+5A<sub>2u</sub>) as well as 21 Raman-active modes were observed. At low temperatures, for x'y' and x'z polarizations, new structure appears which the authors assigned as a two-magnon mode. The assignment of the observed vibrational modes is given according to Cartesian symmetry coordinates and a preliminary force constant calculation on the basis of a rigid-ion model.
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