Superconductors described with CSM.(a new paper, 2008-10-16)

TL;DR

This paper introduces the correlation-sdominated superconducting mechanism (CSM), explaining superconductivity through spin, charge, and spin-charge correlations, and applies it to classify superconductors and interpret experimental effects.

Contribution

It presents a new theoretical framework, CSM, linking correlations to superconductivity and magnetism, and constructs a phase diagram based on these correlations.

Findings

Superconductivity occurs when both spin and charge correlations are strong.

The model explains pressure and isotope effects on Tc.

Classifies superconductors within a new correlation-based phase diagram.

Abstract

The properties of the known superconductors can be explained with the correlations dominated superconducting mechanism (CSM). The correlations have the spin correlation, the charge correlation and the spin-charge correlation, and their strengths can be described by the related correlation lengths in their correlation functions. Our evaluation from many superconductors is that superconductivities occur if both the spin correlation and the charge correlation are stronger, and the calculation of a Hubbard model showed that the spin-charge correlation may govern superconductivities1. Afterwards, this mechanism has led a model which includes various superconductivities and magnetisms, and the relation between superconductivities and magnetisms can be understood on this model2 (these results have been shown by calculations). This mechanism is very practical, for example, to turn a material into a superconductor or increase the Tc of a superconductor, what we will do is to increase the spin-charge correlation. In this letter, we first describe the relations between the spin-charge correlation, the spin correlation and the charge correlation, take these relations as the basis of constructing a new phase diagram, and then classify the known superconductors into various sections in this phase diagram. This letter also gives a new explanation about the pressure effect on Tc, the isotope effect on Tc and the pairing symmetry with the CSM.