Iron-based superconductors are interesting due to their intrinsic magnetism, which often precedes superconductivity. Since 2008, advances have attempted to resolve this apparent but non-obvious link. This has resulted in growing evidence that iron based compounds, especially those containing Fe-X (X =...
a chemical potential shift to match the experimentalkFs and the orbital characters are noted. The insets show the calculated Fermi surfaces and specify the direction of the cuts. Data froms-polarized geometry, which are strongly suppressed owing to matrix element effect69, are amplified by a fact...
A further striking difference is that the oxygen band is much further away from the Fermi level than for the cuprates, see Fig. 1a. Vice versa, the other Ni-3d orbitals are closer to the Fermi energy and slightly doped because of their hybridisation with the Nd-5d orbitals. This raises ...
High-temperature superconductors placed in the center of our research are the type-II superconductors. Therefore, their properties and superconductivity mechanisms are considered in more detail. The term type-II superconductors was first introduced by Abrikosov in his classical paper [4], where he ...
Thus for a charged system, a meaningful result for the superfluid density ρs requires that there be an exact cancellation T≠0 theories We have noted in Section 1.7 that there are three main theoretical approaches to the crossover problem based on T-matrix theories. Their differences are ...
Superconducting materials are hailed as the “holy grail” of condensed matter physics since their applications are so extensive. From levitating trains and quantum computing to faster and more efficient classical electronics, superconductivity is heavily researched for the swathe of use cases that could...
The conference website was very comprehensive; for the fi rst time there was an app with the conference program and useful information that could be downloaded and used on mobile devices; there were no proceedings so that the scientists are now able to submit their highquality papers to ...
derived explicit expressions for the superconducting gap Δ and critical temperature, Tc, of the superconducting transition as a function of the dielectric response function, and demonstrated that their expressions agree with the BCS result. The key observation made in Refs. [1], [2] was that ...
(2) Though the coupling strengths of g and g⊥ are large, the binding energy of Cooper pairs (and thus the critical temperature) is determined by their difference δ, which is one order smaller than the bare couplings as detailed later. (3) The interband pair hopping not only explains ...
Only Fe atoms are plotted in the figure for clarity. (d) Real space structure and spin arrangements of NaFe0.5Cu0.5As in the AF orthorhombic unit cell similar to NaFeAs. In NaFe0.5Cu0.5As, since Fe and Cu form stripes, Na and As also shift slightly from their high-symmetry positions. ...