Myth and Reality in High-Tc Superconductivity
I will discuss two major themes. First I will discuss various experimental developments which seriously restrict the possible theoretical alternatives, such as the electron-based material (Nd − Ce)2CuO4, the low spin susceptibility which shows that the magnitude of the specific heat jump is anomalous, the large gap-like structures at ~ 500 cm−1 observed in photoemission and the infrared, the evidence for small coherence lengths, etc. Second I will discuss some modern trends in the theory of the one-band Hubbard model which is the appropriate theoretical framework for high Tc: separation of charge and spin due to twisted order parameter in the Néel ordered state near half-filling, the topological renormalization due to doping which leads to generalized flux phases, and possible superconducting order parameters in generalized flux phase states.
KeywordsCoherence Length Fano Resonance Superconducting Order Parameter Fermi Liquid Theory Specific Heat Jump
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