Critical temperature enhancement of topological superconductors: A dynamical mean-field study

A mean field interpretation of critical fields in anisotropic superconductors

2014 Anisotropic magnetic critical fields Hc2 are calculated for anisotropic Fermi surface (FS) models by use of mean field theory in the clean limit. The Hohenberg-Werthamer theory is applied numerically for selected FS pieces and Matsubara frequencies. The results are compared with experimental results on various anisotropic materials, in particular organic superconductors. It is proposed tha...

Kiloampere, Variable-Temperature, Critical-Current Measurements of High-Field Superconductors

We review variable-temperature, transport critical-current (I c) measurements made on commercial superconductors over a range of critical currents from less than 0.1 A to about 1 kA. We have developed and used a number of systems to make these measurements over the last 15 years. Two exemplary variable-temperature systems with coil sample geometries will be described: a probe that is only varia...

Low-Temperature Upper-Critical-Field Anomalies in Clean Superconductors.

We interpret the upper-critical-field anomalies observed in some high-temperature superconductors as resulting from the proximity to a zero-temperature quantum critical point. We estimate the shape of the phase boundary between the normal and the superconducting phase by modeling the zerotemperature critical point as the second-order end point of the first-order melting line of the vortex latti...

A dynamical mean-field theory study of Nagaoka ferromagnetism

We revisit Nagaoka ferromagnetism in the two-dimensional U = ∞ Hubbard model using the dynamical mean-field theory (DMFT). A recently developed continuous time quantum Monte Carlo method is applied to solve the DMFT impurity problem. The stability of Nagaoka ferromagnetism is studied as a function of both the nearest-neighbor lattice hopping t and the next-nearest-neighbor lattice hopping t. It...

Dynamical mean-field theory