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The mechanism of high-Tc superconductivity is investigated with interests onthe microscopic aspects of the condensation energy. The theoretical analysis isperformed on the basis of the FLEX approximation which is a microscopicdescription of the spin-fluctuation-induced-superconductivity. Most of phasetransitions in strongly correlated electron system arise from the correlationenergy which is copmetitive to the kinetic energy. However, we show that thekinetic energy cooperatively induces the superconductivity in the underdopedregion. This unusual decrease of kinetic energy below T_c is induced by thefeedback effect. The feedback effect induces the magnetic resonance mode aswell as the kink in the electronic dispersion, and alters the properties ofquasi-particles, such as mass renormalization and lifetime. The crossover fromBCS behavior to this unusual behavior occurs for hole dopings. On the otherhand, the decrease of kinetic energy below T_c does not occur in theelectron-doped region. We discuss the relation to the recent obserbation of theviolation of optical sum rule

Kinetic Energy, Condensation Energy, Optical Sum Rule and Pairing Mechanism in High-TcCuprates

Kinetic Energy, Condensation Energy, Optical Sum Rule and Pairing Mechanism in High-T_cCuprates