This article reviews, from a very personal point of view, the origins and the early work on
transitions driven by topological defects such as vortices in the two dimensional planar rotor …

The main aspects of the theory of phase transitions in two-dimensional degenerate systems
(Berezinskii–Kosterlitz–Thouless, or BKT, transitions) are reviewed in detail, including the …

A magnetic field is used to tune through a new superconducting-insulating transition of
amorphous-composite indium oxide films at various stages of disorder. The results are in …

The dissipation below T c has been studied for representatives of all classes of cuprate high-
temperature superconductors, including Ba 2 YCu 3 O 7− δ, and Bi and Tl compounds. The …

A new dissipation behavior is reported in superconducting Bi 2.2 Sr 2 Ca 0.8 Cu 2 O 8+ δ for
all temperatures below T c and all magnetic fields exceeding H c 1. The current-independent …

We present a comprehensive investigation of the Berezinskii-Kosterlitz-Thouless transition
in ultrathin strongly disordered NbN films. Measurements of resistance, current-voltage …

The dissipation observed at the superconducting transition of the high-T c superconductor Bi
2 Sr 2 Ca Cu 2 O 8 is explained quantitatively by the Kosterlitz-Thouless theory of vortex …

We present detailed evidence for a resistive Kosterlitz-Thouless transition in Y Ba 2 Cu 3 O
7− δ single crystals. The Kosterlitz-Thouless temperature TKT is the onset temperature for …

FeSe is a unique superconductor that can be manipulated to enhance its superconductivity
using different routes, while its monolayer form grown on different substrates reaches a …

We report a detailed study on the transport properties of an ultrathin single-crystal Nb film,
whose thickness (d≊ 20 Å) is less than all other relevant length scales except the lattice …