Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-05-16
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 5 figures, submitted to PRB
Scientific paper
A large body of experimental data point towards a charge transfer instability of parent insulating cuprates to be their unique property. We argue that the true charge transfer gap in these compounds is as small as 0.4-0.5\,eV rather than 1.5-2.0\,eV as usually derived from the optical gap measurements. In fact we deal with a competition of the conventional (3d$^9$) ground state and a charge transfer (CT) state with formation of electron-hole dimers which evolves under doping to an unconventional bosonic system. Our conjecture does provide an unified standpoint on the main experimental findings for parent cuprates including linear and nonlinear optical, Raman, photoemission, photoabsorption, and transport properties anyhow related with the CT excitations. In addition we suggest a scenario for the evolution of the CuO$_2$ planes in the CT unstable cuprates under a nonisovalent doping.
No associations
LandOfFree
What is the true charge transfer gap in parent insulating cuprates? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with What is the true charge transfer gap in parent insulating cuprates?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and What is the true charge transfer gap in parent insulating cuprates? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-77985