Harald Olaf Jeschke

TL;DR: In this article, a detailed study of the three-dimensional crystal structure using x-ray diffraction on untwinned crystals combined with structural relaxation calculations was performed, and the authors found evidence for a parent crystal structure with a monoclinic unit cell corresponding to a stacking of layers with a unidirectional in-plane offset, in contrast with the currently assumed trigonal three-layer stacking periodicity.

TL;DR: In this paper, the authors re-evaluate the magnetic interactions in three spin liquid candidate materials, using nonperturbative exact diagonalization methods, and help estimate the potential for realizing the spin liquid state in real materials.

TL;DR: In this paper, the influence of magnetic frustration in the superconductivity of iron selenide was examined and a theoretical study was conducted to understand the magnetic mechanism for superconductability in iron-based materials.

TL;DR: This work shows that the key structural features in BaFe2As2, namely suppression of the tetragonal-to-orthorhombic phase transition and reduction in the As-Fe-As bond angle and Fe-Fe distance, show the same behaviour under pressure as found in chemically substituted samples, and suggests that modification of the Fermi surface by structural distortions is more important than charge doping for inducing superconductivity in Ba Fe 2As2.

TL;DR: GaCu3(OH)6Cl2 (Ga-substituted herbertsmithite) is proposed as a correlated Dirac-Kagome metal combining Dirac electrons, strong interactions and frustrated magnetic interactions and it is observed that it has symmetry-protected Dirac points at the Fermi level.