³³S Nuclear Magnetic Resonance Spectra of Uranium Disulfide β-US₂

Abstract

Uranium disulfide β-US 2 , which shows a semimetal-to-semiconductor crossover, is investigated by the nuclear magnetic resonance (NMR) of 33 S nuclei with the nuclear spin of I = 3/2. Because the natural concentration (0.76%) of NMR active 33 S nuclei is too dilute, the isotopic enrichment to ∼50% has been carried out during the single crystal growth. The 33 S NMR spectra have been successfully obtained using a single crystal of β-US 2 with external fields along the crystallographic c axis. The S sites assignments have been made based on these NMR spectra.