The mid-infrared AC Hall effect in optimally-doped BSCCO

TL;DR

This study measures the mid-infrared Hall effect in optimally doped BSCCO across various frequencies and temperatures, revealing discrepancies with previous YBCO data and providing insights into charge dynamics and scattering mechanisms.

Contribution

It introduces a novel heterodyne polarimetry system to accurately measure the Hall effect in BSCCO, highlighting differences from prior YBCO studies and analyzing the data with an extended Drude model.

Findings

Hall mass comparable to ARPES Fermi mass

Scattering rate aligns with low-frequency conductivity

Hall effect scattering rates are quarter of ARPES values

Abstract

A novel heterodyne polarimetry system determines the frequency dependence from 900 to 1100 cm^-1 and temperature dependence from 35 to 330 K of the Hall transport in single crystal, optimally doped BSCCO. The results show a significant disconnect from the behavior of the Hall angle in the existing data for YBCO in the far-infrared, which indicate a negative value for the real part of the Hall angle above 250 cm^-1, whereas that of the current work at 1000 cm^-1 is positive. The current work when analyzed using an extended Drude formalism results in a Hall mass comparable to the ARPES Fermi mass and a scattering rate comparable to the low frequency conductivity and Hall effect scattering rates, which, however, are only 1/4 of the ARPES values.