The normal state of high temperature oxide superconductor |
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Authors: | ZHANG Liyuan Feng Xiaobing |
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Institution: | 1. Department of Physics, Peking University, Beijing 100871, China 2. Dalian Railway Institute, Dalian 116028, China |
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Abstract: | Looking back on the experiments about the normal state of the high temperature superconductor (HTS), the authors point out
nine important experimental results. On the basis of these results, the authors have argued that the two-dimension, two-subsystem
Hamiltonian is the appropriate starting point for describing the normal state of HTS. By this Hamiltonian, using the decoupling
approximation of Green’s function method by Kaga through numerical calculations, the authors have obtained the temperature
dependent pseudogap in the density of states (DOS), which is consistent qualitatively with the experimental results by angle-resolved
photoemission spectroscopy (ARPES). Theoretically, this Hamiltonian has the superconducting order parameter of d + s symmetry
with d-wave as the main component, which is consistent with experiments. Further, the quantum electronic liquid in HTS is
a near Fermi liquid in which there is coexistence of the delocalized states and nearly localized states, and there is finite
probability for the nearly localized carriers to form the nearly localized carrier pairs at any finite temperature. |
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Keywords: | high temperature superconductivity pseudogap symmetry near Fermi liquid |
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