Metal-insulator transitions are accompanied by huge resistivity changes, even over tens of
orders of magnitude, and are widely observed in condensed-matter systems. This article …

Stimulated by the discovery of high-temperature superconductivity, the electronic structure of
late 3d transition-metal oxides is presently one of the most extensively studied subjects in …

Despite twenty years of research, the phase diagram of high-transition-temperature
superconductors remains enigmatic,. A central issue is the origin of the differences in the …

We describe the LDA band structre of YBa2Cu3O7 in the ϵF±2 eV range using orbital
projections and compare with YBa2Cu4O8. Then, the high-energy and chain-related …

This is a revised version of the first edition published in 1991. At the same time, this is a
revised version of the Syokabo edition, which was written in Japanese and published in …

The microscopic theory of superconductivity worked out by Bardeen, Cooper, and Schrieffer
led to a fundamental understanding of the phenomenon. However, this theory does not …

We characterize the nature of the Van Hove singularity near the Fermi energy (EF) in Y Ba 2
Cu 4 O 8 using ultrahigh energy resolution (10 meV) angle-resolved photoemission …

The plasma with c-axis polarization in cuprate superconductors has a very low frequency.
Experiments show that in some of the cuprate superconductors the plasma frequency is …

We argue that extended saddle points observed at the Fermi level for optimally doped
superconductors are essentially the bifurcated saddle points predicted by density-functional …

Angle-resolved photoemission studies of the dispersion relations and polarization
dependence of bands in the near EF region of untwinned YBa 2 Cu 3 O 7− δ (Y123) single …