NORMAL-STATE AC HALL-EFFECTS IN YBA2CU3O7 THIN-FILMS

We have measured the magnetotransmission of thin film samples of YBa2C u3O7 in the normal state using circularly polarized light at frequenci es from 15 to 180 cm(-1) The magneto-optical signal is consistent with the ac Hall effect of holes with a reduced scattering rate and an enh anced mass compared to the zero-field transport parameters. This resul t agrees with a simple high-frequency extension of models which have b een developed to explain the anomalous de Hall effect in the normal st ate of high-T-c superconductors.