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 …

ONE of the long-standing mysteries associated with the high-temperature copper oxide
superconductors concerns the anomalous suppression1 of superconductivity in La2 …

The Van Hove singularity (VHS) provides a paradigm for the study of the role of peaks in the
density of states (dos) on electronic properties. More importantly, it appears to play a major …

We show that a system with competing interactions on different length scales, relevant to the
formation of stripes in doped Mott insulators, undergoes a self-generated glass transition …

The magnetic phase diagram of La 2− x Sr x CuO 4 in the antiferromagnetic regime (x≤
0.02) has been derived from La 139 nuclear quadrupole resonance studies from 4 to 250 K …

We have used La 139 nuclear quadrupole resonance (NQR) and positive muon spin
rotation (μSR) measurements to probe the weakly doped antiferromagnetic (AF) region (x< …

We review various isotope effects in the high-T c cuprate superconductors to assess the role
of the electron-phonon interaction in the basic physics of these materials. Of particular …

Three-dimensional, commensurate long-range magnetic order in La 2 CuO 4 quickly
evolves to quasi-two-dimensional, incommensurate correlations upon do** with mobile …

The nature of phase separation in Pr 0.5 Sr 0.5 MnO 3 has been probed by linear, as well as
nonlinear, magnetic susceptibilities and resistivity measurements across the second order …