Abstract
Coherent time-domain spectroscopy was used to measure the complex transmission tensor of three YBa 2Cu 3O 7−δ thin films in magnetic fields up to 6 T at temperatures from 10 to 200 K. The complex conductivity tensor was determined from transmission measurements in the frequency range 100–800 GHz without the need for Kramers-Kronig analysis. Both the real and imaginary parts of σ xy were found to peak near 40 K, exceeding their normal state values by more than a factor of ten. This behavior is ascribed to the Hall effect of quasiparticles in the superconducting state.
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