Abstract
The optical properties of low-dimensional dielectric cuprates, including parent systems for high-temperature superconductors, such as La2CuO4, Sr2CuO2Cl2, and YBa2Cu3O6 are briefly reviewed. The main focus is on the d–d and p–d charge transfer transitions, which determine the fundamental absorption band. The analysis of optical properties shows the instability of parent cuprates against the d–d charge transfer with the formation of metastable electron–hole (EH) dimers of the Cu1+–Cu3+-type pairs coupled by the two-particle transfer and characterized by the giant electric polarizability. The formation of a system of stable EH dimers upon nonisovalent substitution determines the unconventional properties of the pseudogap and superconducting phases of doped cuprates.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
