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HL: Fachverband Halbleiterphysik

HL 33: Poster Session III

HL 33.34: Poster

Mittwoch, 14. März 2018, 17:30–19:30, Poster F

Raman spectroscopy of the copper oxide phases Cu₄O₃ and CuO: A first principles study — Marcel Giar, Markus Heinemann, and •Christian Heiliger — Institute of Theoretical Physics, Justus-Liebig-University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany

We present first principles Raman spectroscopic investigations of the binary oxides Cu₄O₃ and CuO. For monoclinic CuO different (magnetic) unit cells must be considered at room temperature and below 213 K. These structures particularly differ by their local symmetry. The resulting effects on the Raman spectrum are discussed in detail and experimental observations [1] are explained. We further study the laser energy dependence of the Raman spectrum of both the room temperature and the low temperature structure. For tetragonal Cu₄O₃ experimental Raman spectra have only recently been obtained [2,3]. For this material we present a detailed analysis of the Raman scattering properties with particular emphasis on the crystal orientation and the angular dependence of the Raman intensities.

[1] X. K. Chen, J. C. Irwin, and J. P. Franck, Phys. Rev. B 52, R13130 (1995)

[2] B. K. Meyer, A. Polity, D. Reppin, M. Becker, P. Hering, P. J. Klar, T. Sander, C. Reindl, J. Benz, M. Eickhoff, C. Heiliger, M. Heinemann, J. Bläsing, A. Krost, S. Shokovets, C. Müller, and C. Ronning, Phys. Status Solidi B 249, 1487 (2012)

[3] L. Debbichi, M. C. M. de Lucas, J. F. Pierson, and P. Krüger, J. Phys. Chem. C 116, 10232 (2012)