Phase diagram and oxygen annealing effect of FeTe1−Se iron-based superconductor

Phase diagram of electron systems near the superconductor-insulator transition.

The zero temperature phase diagram of Cooper pairs exposed to disorder and a magnetic field is determined theoretically from a variational approach. Four distinct phases are found: a Bose and a Fermi insulating, a metallic, and a superconducting phase, respectively. The results explain the giant negative magnetoresistance found experimentally in In-O, TiN, Be and high-T(c) materials.

Experimental aspects of Alpha, Beta angles distortion on superconductivity in 1111-type Iron-based superconductor

In this research, we aim to clarify the relationship between the structural distortion due to doping and the superconductivity existence in the FeAs4 structure. For this, we have prepared polycrystalline of NdFeAsO0.8F0.2, NdFeAs0.95Sb0.05O0.8F0.2 and Nd0.99Ca0.01FeAsO0.8F0.2 samples by one-step solid state reaction method. The structural and electrical properties of the samples were characteri...

New phase diagram of oxygen at high pressures and temperatures.

In situ high P-T Raman measurements and optical observations of solid and fluid oxygen up to 1250 K between 8 and 25 GPa reveal the existence of a new molecular phase eta and strikingly unusual behavior of the melting curve. Three triple points were also identified in the P-T domain of the new phase. The data give a direct measure of the melting curve that greatly extends previous optical inves...

Phase diagram and gap anisotropy in iron-pnictide superconductors

Hiroaki Ikeda,1,* Ryotaro Arita,2,3,4 and Jan Kuneš5,6 1Department of Physics, Kyoto University, Kyoto 606-8502, Japan 2Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan 3TRIP, JST, Sanbancho, Chiyoda, Tokyo 102-0075, Japan 4CREST, JST, Hongo, Tokyo 113-8656, Japan 5Center for Electronic Correlations and Magnetism, Theoretical Physics III, University of Augsburg, 86135 A...

formulation of diclofenac microemulsion based on phase diagram