P. Steffens

TL;DR: The results support recent theoretical proposals that both nematicity and superconductivity are driven by spin fluctuations.

TL;DR: In this article, the authors reported neutron scattering measurements that reveal broad spin excitations covering a wide region of the Brillouin zone in an extremely clean antiferromagnet YbMgGaO4.

TL;DR: In this article, the authors used neutron scattering to study structurally the simplest iron-based superconductor FeSe, which displays a nematic (orthorhombic) phase transition at $T_s=90$ K, but does not order antiferromagnetically.

TL;DR: In this paper, the frustrated spinel has been shown to possess highly coupled spin, lattice, and orbital degrees of freedom using large single crystal and powder samples, and a distortion from spinel at room temperature (space group $F\overline{4}3m$) which allows for a greater trigonal distortion of the octahedra and a low-temperature space group that maintains the mirror plane symmetry.

TL;DR: In this article, the authors used neutron scattering on the tetragonal cuprate HgBa2CuO4+δ revealing commensurate antiferromagnetic excitations as a signature of the pseudogap state.