FeSe-based superconductors (11, 122-type): phase diagram, crystal growth and characterization

Phase diagram of vortex matter of type-II superconductors

We propose a model to construct the phase diagram for type-II superconductors through molecular-dynamics simulation. In this model, the Abrikosov vortices interact with long-range repulsion and short-range attraction. We are able to obtain the phase diagrams consisting of the vortex lattice, the intermediate-mixed phase (IMP), and the disordered vortex phase in the B-T , B-κ, and B-q planes, wh...

The preparation and phase diagrams of (7Li1xFexOD)FeSe and (Li1xFexOH)FeSe superconductors

Conventional empirical law reverses in the phase transitions of 122-type iron-based superconductors

Phase transition of solid-state materials is a fundamental research topic in condensed matter physics, materials science and geophysics. It has been well accepted and widely proven that isostructural compounds containing different cations undergo same pressure-induced phase transitions but at progressively lower pressures as the cation radii increases. However, we discovered that this conventio...

ARPES Results of ’122’ Iron-based Superconductors

The discovery of superconductivity in iron pnictides has attracted considerable interest of the condensed matter physics community [1]. The superconductivity has been observed in both 1111 and 122 system. These superconductors display a fascinating interplay between magnetism and superconductivity. Two kinds of techniques are mainly performed to study these materials. One is the neutron scatter...

Vortex-Line Phase Diagram for Anisotropic Superconductors

The zero temperature vortex phase diagram for uniaxial anisotropic superconductors placed in an external magnetic field tilted with respect to the axis of anisotropy is studied for parameters typical of BSCCO and YBCO. The exact Gibbs free energy in the London approximation, using a self-energy expression with an anisotropic core cutoff, is minimized numerically, assuming only that the equilibr...