Influence of temperature on raman spectra of the FeS2 single crystal with pyrite structure

Raman scattering in a natural FeS2 single crystal with the pyrite structure was investigated in the temperature range of 80–300 K. All five Raman-active modes E g , T g (1), T g (2), A g , and T g (3) were observed under normal conditions (T = 23°C). The influence of temperature on the Raman spectra was studied in the HH configurations (polarizations of the incident and scattered radiations are parallel), which made it possible to detect the strongest spectral lines A g and E g . Widths of modes E g and A g were substantially smaller than those given in previous publications. It was found that the temperature dependences of frequencies and widths (FWHM) of modes A g and E g are approximated well by the Klemens model, which describes the three-phonon scattering mechanism.