Pairing symmetry in the cuprate superconductors is an important and controversial topic.
The recent development of phase-sensitive tests, combined with the refinement of several …

Although the vast majority of high-T c cuprate superconductors are hole-doped, a small
family of electron-doped compounds exists. Underinvestigated until recently, there has been …

Since the first days of high-T c superconductivity, the materials science and the physics of
grain boundaries in superconducting compounds have developed into fascinating fields of …

Recent studies of the electromagnetic response of high-T c superconductors using terahertz,
infrared, and optical spectroscopies are reviewed. In combination these experimental …

Inelastic light scattering is an intensively used tool in the study of electronic properties of
solids. Triggered by the discovery of high-temperature superconductivity in the cuprates and …

This topical review summarizes various features of magnetic penetration depth in
unconventional superconductors. Precise measurements of the penetration depth as a …

The formation of bound states at surfaces of materials with an energy gap in the bulk
electron spectrum is a well known physical phenomenon. At superconductor surfaces …

In this article we review essential natures of superconductivity in strongly correlated electron
systems (SCES) from a universal point of view. First we summarize experimental results on …

We present point contact spectroscopy (PCS) data for junctions between a normal metal and
the electron-doped cuprate superconductor Pr 2− x Ce x CuO 4 (PCCO). For the …

Inverse freezing and inverse melting are processes where a more symmetric phase is found
at lower temperatures than at higher temperatures. Such inverse transitions are very rare …