Suppression of Superconductivity and Nematic Order in FeSeS (0 ≤ ≤ 1; ≤ 0.1) Crystals by Anion Height Disorder.

Connections between crystal chemistry and critical temperature have been in the focus of superconductivity, one of the most widely studied phenomena in physics, chemistry, and materials science alike. In most Fe-based superconductors, materials chemistry and physics conspire so that correlates with the average anion height above the Fe plane, i.e.

Influence of crystal structure and oxygen vacancies on optical properties of nanostructured multi-stoichiometric tungsten suboxides.

Four distinct tungsten suboxide (WO) nanomaterials were synthesized via chemical vapour transport reaction and the role of their crystal structures on the optical properties was studied. These materials grow either as thin, quasi-2D crystals with the WOformula (in shape of platelets or nanotiles), or as nanowires (WO, WO). For the quasi-2D materials, the appearance of defect states gives rise to two indirect absorption edges.

Short-Range Order in VI.

We present a detailed investigation of the crystal structure of VI, a two-dimensional van der Waals material of interest for studies of low-dimensional magnetism. As opposed to the average crystal structure that features 3̅ symmetry of the unit cell, our Raman scattering and X-ray atomic pair distribution function analysis supported by density functional theory calculations point to the coexistence of short-range ordered 3̅1 and long-range ordered 3̅ phases. The highest-intensity peak, , exhibits a moderate asymmetry that might be traced back to the spin-phonon interactions, as in the case of CrI.