Heterodyne polarometry is used to measure the frequency dependence in the mid IR from 900 to 1100 cm−1 and temperature dependence from 35 to 330 K of the normal state Hall transport in single crystal, optimally doped Bi2Sr2CaCu2O8+δ. The results show a simple Drude behavior in the Hall conductivity σxy which stands in contrast to the more complex, extended Drude behavior for the longitudinal conductivity σxx. The mid IR Hall scattering rate γxy increases linearly with temperature and has a small, positive, projected intercept at T=0. The longitudinal scatter rate, in contrast, is much larger and exhibits very little temperature dependnece. The Hall frequency indicates a carrier mass which is 6.7 times the band mass and which decreases slighly with increasing frequency. These disparate behaviors are consistent with calculations based on the fluctuation-exchange interaction using current vertex corrections.
@article{arxiv.cond-mat/0510793,
title = {The mid-infrared Hall effect in optimally-doped Bi_2 Sr_2 CaCu_2 O_{8+\delta}},
author = {D. C. Schmadel and G. D. Gu and Hiroshi Kontaini and H. D. Drew},
journal= {arXiv preprint arXiv:cond-mat/0510793},
year = {2007}
}