By Ece Uykur
In this thesis, the pseudogap and the precursor superconducting country, that are of serious significance in clarifying the superconductivity mechanism in high-temperature cuprate superconductors, are investigated with a c-axis optical examine in YBa2(Cu1-xZnx)3Oy. checking out used to be played over a large power variety with smaller temperature periods for a number of Zn-substituted samples, in addition to for numerous carrier-doping levels.
A spectral weight (SW) research, during which the pseudogap habit should be separated from the superconducting condensate with the SW move to the high-energy zone, published that the pseudogap isn't the precursor of the superconductivity (carriers relocating to the high-energy quarter with pseudogap starting by no means give a contribution to the superconducting condensation). furthermore, the high-energy move maintains even under Tc for the Zn-substituted samples (in which we weaken the superconductivity), which supplies proof to the coexistence of the pseudogap and the superconducting hole lower than Tc.
On the opposite hand, the research of optical conductivity published precursor country to superconductivity should be outlined at temperatures a lot better than Tc. The superconducting service density (ns) was once calculated for every temperature (above and under Tc) and the consequences proven the life of ns at temperatures above Tc. The saw genuine superconducting condensate (ns) above Tc places a major constraint at the concept for high- Tc superconductivity. A idea in keeping with an inhomogeneous superconducting country, within which a microscopically phase-separated kingdom in a doped Mott insulator may be saw, is the main believable candidate. This thought can clarify the lifestyles of ns and the saw temperature diversity for the precursor superconducting state.
The effects received express that the pseudogap coexists with superconductivity under Tc and isn't the precursor of superconductivity. nevertheless, it's also attainable to outline a precursor superconducting kingdom that's varied than the pseudogap. The temperature diversity and the saw superconducting condensate during this kingdom might be defined with the aid of the inhomogeneous superconducting state.