Infrared hall effect in high- T(c) superconductors: evidence for non-fermi-liquid hall scattering
Infrared ( 20-120 and 900-1100 cm(-1)) Faraday rotation and circular dichroism are measured in high- T(c) superconductors using sensitive polarization modulation techniques. Optimally doped YBa2Cu3O7 thin films are studied at temperatures in the range ( 15<T<300 K) and magnetic fields up to 8 T. At 1000 cm(-1) the Hall conductivity sigma(xy) varies strongly with temperature in contrast to the longitudinal conductivity sigma(xx) which is nearly independent of temperature. The Hall scattering rate gamma(H) has a T2 temperature dependence but, unlike a Fermi liquid, depends only weakly on frequency. The experiment puts severe constraints on theories of transport in the normal state of high- T(c) superconductors.
Cerne
J
Center for Superconductivity Research and Department of Physics, University of Maryland, College Park, Maryland 20741, USA.
Grayson
M
Schmadel
DC
Jenkins
GS
Drew
HD
Hughes
R
Dabkowski
A
Preston
JS
Kung
P