Copper Oxide Superconducting Mechanism Of High Temperature Superconducting Materials And Their Unusual Physical Properties

The study of the superconducting mechanism is the key in the rearch on doped cuprates, while that of the anomalous normal-state behaviors is the central problem. In this paper, within the t-t'-J model and fermion-spin theory, the anomalous charge dynamics, the unusual heat transport, the interplay between the single particle coherence and kinetic energy driven superconductivity, the doping and energy dependent of the magnetic excitations in the superconducting state, and the charge asymmetry in superconductivity of hole- and electron-doped cuprates are studied systematically.The paper is organized as follows: in chapter I, a brief review of theories and experiments in superconductivity of doped cuprates is given, and the t-J model is also introduced. In chapter II, a charge-spin separation fermion-spin theory is developed. In this approach, the physical electron is decoupled as a gauge invariant dressed holon and spin, then the local single occupancy constraint is treated properly.Within the t-t'-J model and fermion-spin theory, we study the anomalous normal-state properties of doped cuprates in chapter III: firstly, we study the in-plane charge dynamics of hole-doped cuprates in the heavily underdoped regime, and find that the conductivity spectrum contains a non-Drude low energy peak and a broad midinfrared band, while the temperature dependent resistivity is characterized by a crossover from the moderate temperature metallic-like to the low temperature insulating-like behavior in the heavily underdoped regime, and a temperature linear dependence with deviations at low temperatures in the underdoped regime. Secondly, the doping dependence of charge dynamics in the electron-doped cuprates is studied. It is shown that the conductivity spectrum shows an unusual low-energy peak and a rather sharp midinfrared peak. The resistivity exhibits a crossover from the high temperature metallic-like to low temperature insulating-like behavior in the relatively low doped regime and a metallic-...