12 research outputs found

    Strong-coupling theory of superconductivity in a degenerate Hubbard model

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    In order to discuss superconductivity in orbital degenerate systems, a microscopic Hamiltonian is introduced. Based on the degenerate model, a strong-coupling theory of superconductivity is developed within the fluctuation exchange (FLEX) approximation where spin and orbital fluctuations, spectra of electron, and superconducting gap function are self-consistently determined. Applying the FLEX approximation to the orbital degenerate model, it is shown that the dx2−y2d_{x^2-y^2}-wave superconducting phase is induced by increasing the orbital splitting energy which leads to the development and suppression of the spin and orbital fluctuations, respectively. It is proposed that the orbital splitting energy is a controlling parameter changing from the paramagnetic to the antiferromagnetic phase with the dx2−y2d_{x^2-y^2}-wave superconducting phase in between.Comment: 4 figures, submitted to PR

    Introduction

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    Murderous Mothers and the Extended Network of Shame

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    The Pendulum of Opinion: Changing Attitudes to Infanticide

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    The Fragmentation of Geopolitical Space: What Secessionist Movements Mean to the Present-Day State System

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