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 …

Theoretical ideas and experimental results concerning high-temperature superconductors
are reviewed. Special emphasis is given to calculations performed with the help of …

We present an experimental review of the nature of the pseudogap in the cuprate
superconductors. Evidence from various experimental techniques points to a common …

Tunneling spectroscopy has played a central role in the experimental verification of the
microscopic theory of superconductivity in classical superconductors. Initial attempts to apply …

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 …

The Fermi surface—the set of points in momentum space describing gapless electronic
excitations—is a central concept in the theory of metals. In this context, the normal …

Optical reflectivity spectra are studied for single crystals of the prototypical high-T c system
La 2− x Sr x CuO 4 over a wide compositional range 0≤ x≤ 0.34, which covers insulating …

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 photoemission line shapes of the optimally doped cuprate Bi2Sr2CaCu2O8+ δ were
studied in the direction of a node in the superconducting order parameter by means of very …

The electronic structure of simple crystalline solids can be completely described in terms
either of local quantum states in real space (r-space), or of wave-like states defined in …