4 research outputs found
Exploring disorder correlations in superconducting systems: spectroscopic insights and matrix element effects
Understanding the intricate interplay between disorder and superconductivity has become a key area of research in condensed matter physics, with profound implications for materials science. Recent studies have shown that spatial correlations of disorder potential can improve superconductivity, prompting a re-evaluation of some theoretical models. This paper explores the influence of disorder correlations on the fundamental properties of superconducting systems, going beyond the traditional assumption of spatially uncorrelated disorder. In particular, we investigate the influence of disorder correlations on key spectroscopic superconductor properties, including the density of states, as well as on the matrix elements of the superconducting coupling constant and their impact on the localization length. Our findings offer valuable insights into the role of disorder correlations in shaping the behavior of superconducting materials
Synthesis and Comparative Photoswitching Studies of Unsymmetrical 2,3-Diarylcyclopent-2-en-1-ones
Photochromic diarylethenes (DAEs)
based on the unsymmetrical ethene
“bridge” bearing heterocycles of the different nature
(oxazole and thiophene) as aromatic moieties have been designed and
the photoswitching properties have been studied. The comparative studies
of the photochromic characteristics of unsymmetrical isomeric 2,3-diarylcyclopent-2-en-1-ones
have shown that the isomers have different thermal stability, absorption
maxima, and quantum yields. It was found that the unsymmetrical diarylÂcycloÂpentenone
bearing at second position of the cyclopentenone ring the thiophene
unit displays high thermally stability, hypsochromic shift of absorption
maxima wavelengths of initial and cyclic forms, and high quantum yields
of cyclization and cycloreversion reactions. The replacement of the
carbonyl group with oxime leads to a reduction of the difference in
the photochromic properties of these isomers and just as the reduction
of the carbonyl group to the hydroxy-group negates this difference
to zero. The intramolecular hydrogen bond formation in the oxime and
hydroxy derivatives was confirmed by IR and <sup>1</sup>H NMR spectral
analysis, but the increase of the quantum yields of the cyclization
reaction in a nonpolar hexane is observed only in the case of hydroxy
derivatives that can be explained by the formation of more rigid six-membered
heterocycle in hydrogen bonding
Density of states in the presence of spin-dependent scattering in SF bilayers: a numerical and analytical approach
We present a quantitative study of the density of states (DOS) in SF bilayers (where S is a bulk superconductor and F is a ferromagnetic metal) in the diffusive limit. We solve the quasiclassical Usadel equations in the structure considering the presence of magnetic and spin–orbit scattering. For practical reasons, we propose the analytical solution for the density of states in SF bilayers in the case of a thin ferromagnet and low transparency of the SF interface. This solution is confirmed by numerical calculations using a self-consistent two-step iterative method. The behavior of DOS dependencies on magnetic and spin–orbit scattering times is discussed