Comment on 'Optical and magneto-optical properties of AuMnSn' [Appl. Phys. Lett. 88, 121909 (2006)]

摘要

It has recently been reported that the experimental maximum Kerr rotation and ellipticity for AuMnSn are shifted 0.6 eV higher in energy than that predicted from our full-potential density-functional calculations. Similarly, the intensity of the measured Kerr rotation spectra turned out to be about three times smaller than our predicted values and it was argued that the failure of the local spin-density approximation to account for the correlation effect is responsible for these discrepancies. However, the magneto-optical Kerr effect measurements were made at room temperature on non-stoichiometric crude single crystals, whereas our calculated spectra are valid for ideal stoichiometric single crystals at low temperatures.