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28 March 2024
 
  » arxiv » cond-mat/0010221

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Polarized far-infrared and Raman spectra of SrCuO2 single crystals
Z. V. Popovi’c ; M. J. Konstantinovi’c ; R. Gaji’c ; C. Thomsen ; U. Kuhlmann ; A. Vietkin ;
Date 16 Oct 2000
Journal Physica C 351, 386 (2001)
Subject Strongly Correlated Electrons | cond-mat.str-el
Affiliation1,3), M. J. Konstantinovi’c (2,3), R. Gaji’c , C. Thomsen , U. Kuhlmann and A. Vietkin ( VSM-Lab, K. U. Leuven, Belgium, MPI-FKF, Stuttgart, F. R. Germany, Institute of Physics - Belgrade, Yugoslavia, Institut für Festkörperp
AbstractWe measured polarized far-infrared reflectivity and Raman scattering spectra of SrCuO$_2$ single crystals. The frequencies for infrared-active modes were determined using an oscillator-fitting procedure of reflectivity data. The Raman spectra were measured at different temperatures using several laser energies $omega_L$. In addition to eight of twelve Raman active modes, predicted by factor-group analysis, we observed a complex structure in the Raman spectra for polarization parallel to the {f c}-axis, which consists of Raman-allowed A$_g$ symmetry modes, and B$_{1u}$ LO infrared-active (Raman-forbidden) modes of the first and higher order as well as their combinations. The Raman-forbidden modes have a stronger intensity at higher $omega_L$ than the Raman-allowed ones. In order to explain this resonance effect, we measured the dielectric function and optical reflection spectra of SrCuO$_2$ in the visible range. We show that the Raman-allowed A$_g$ symmetry modes are resonantly enhanced when a laser energy is close to $E_0$, while Raman-forbidden (IR-active) modes resonate strongly for laser line energies close to the electronic transition of higher energy gaps.
Source arXiv, cond-mat/0010221
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