Philipp Gegenwart

TL;DR: In this paper, single-crystal x-ray diffraction, density-functional band-structure calculations, and muon spin relaxation were used to probe pressure evolution of the triangular spin-liquid candidate YbMgGaO$_4.

TL;DR: In this paper, the authors used time and energy-resolved optical spectroscopy to investigate the coupling of electron-hole excitations to the magnetic environment in the relativistic Mott insulator.

TL;DR: In this article, the effect of weak substitutional disorder in the rare-earth intermediate layer in between the NiB-networks was investigated theoretically as well as experimentally, and the suppression of the upper critical field and its positive curvature near Tc were shown to be a highly sensitive measure of small amounts of disorder even at the rare earth site.

TL;DR: In this paper, the authors categorize thirteen materials, ranging from heavy fermion metals to frustrated magnets, where such experimental signatures have been found, and show that most of them do not show a zero-field QCP.

TL;DR: In this article, two UAsSe single crystals with slight variations of the As/Se content ratio have been investigated and the development of the low-T upturn in the resistivity is accompanied by smooth decrease of the Curie temperature.