The transition mechanism of metal-insulator in metal oxides is discussed in detail, which is a part of the mechanism of superconductivity. Through the study of magic angle twisted bilayer graphene superconductor and other new findings on superconductivity, we further demonstrate that the physical mechanism of superconductivity proposed in the Part I is the only correct way to handle the properties of superconductivity in various materials. We propose that superfluid helium consists of normal liquid helium mixed with high-energy helium atoms. Based on this new model, all peculiar features discovered in superfluid helium can be truly understood, such as its climb on the containers wall, its fountain effect, the discontinuity of specific heat capacity at phase transition point, as well as the maintaining mass current in ring-shaped container. We demonstrate that the high-energy particles play a driving force role in both superconductors and superfluid helium, and therefore dominate their properties.
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