Cuprates superconductivity

Key words Cuprates, superconductivity, photoemission, films, strain, Tc, laser ablation... 

Abstract Since the discovery of high 7C cuprates, superconductivity has been sought... 

Electron—hole asymmetry is encountered in cuprate superconductors.3 In the cuprates, superconductivity occurs in the electron-doped regime, although not as prominently as in the hole-doped regime. The electron-... 

THE ISING, SMALL-BIPOLARON THEORY OF CUPRATE SUPERCONDUCTIVITY... 

The Ising, small-bipolaron (ISB) theory of cuprate superconductivity (Section 8) employs NUHH where, just as in BCS theory, it is a consequence of vibronic interaction which overrides the positive U. 

The theory of the cuprate superconductivity must explain all above experimental facts, and the mechanism of the superconductivity itself. The strong Coulomb repulsion is certainly a very important ingredient as is manifested by the fact that parents compounds are Mott insulators. However, we will show that, in addition to it, strong hole-lattice interactions are also very important. In this review, we will present explanations for some of the above anomalies by including the strong hole-lattice interactions. 

In the previous section, we have presented the evidence that the small polaron is an important ingredient of the cuprate superconductivity. In this section, we show that the spin-vortex is another important ingredient. 

By now, we have identified three important ingredients in the cuprate superconductivity strong on-site Coulomb repulsion, small polaron formation, and spin-vortex formation. With all these ingredients, however, the conventional transport theory based on Bloch electrons will predict that the system is an insulator. In order to... 

Table 4.7 High-temperature cuprate superconducting oxides...

We have seen in the previous section that the single-layer materials exhibit substantial R-Cu exchange coupling, and they also have modest (for cuprates) superconducting transition temperatures. For the materials that contain midtiple Cu-O layers the Tc values... 

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