In-plane optical conductivity and pseudogaps in electron-doped cuprate superconductors
May 25, 2006
3:00PM to 4:00PM
Date(s) - 25/05/2006
3:00 pm - 4:00 pm
Title: In-plane optical conductivity and pseudogaps in electron-doped cuprate superconductors
Speaker: Dr. Nicole Bontemps
Laboratoire de Physique du Solide
10 rue Vauquelin, 75005 Paris (France)
Location: ABB 162
New quantitative approaches relying on infrared and visible measurements in cuprates have been initiated for the last few years, such as tracking the optical spectral weight with temperature and carrier concentration. This is of special interest because spectral weight shifts with temperature are the hallmark of the onset of gaps opening at the Fermi surface.
I will illustrate this point by presenting some of our most significant results in electron-doped cuprates. I will show that, in contrast with the hole doped materials we have studied (Bi2Sr2CuO 8+d), we see a clear opening of a “pseudogap” in the electron-doped Pr2-xCexCuO4 thin films, which seems to close at x=0.17. I will discuss its possible magnetic origin.