Bulk electronic states of high-Tc cuprate superconductors studied by high-resolution angle-resolved photoemission spectroscopy

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We have constructed low-energy ultrahigh-resolution photoemission spectrometer to elucidate the bulk electronic states in the vicinity of the Fermi level in high-temperature cuprate superconductors, and have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) studies of cuprates and related materials. We have found an existence of two different types of pseudogaps above superconducting transition temperature in single- and multi-layered Bi-based cuprates by the systematic temperature- and momentum-dependent ARPES measurements. In addition, we have clarified the electronic states of related materials, such as cobalt oxides and iron-based superconductors, and revealed characteristic similarities/dissimilarities among these superconductors, which are a key to the deeper understanding of the mechanism of high-temperature superconductivity.