Pressure-induced changes in the electronic structure of arsenic and antimony metal - art. no. 115111

The pressure dependence of nuclear spin lattice relaxation (NSLR) in semime tallic arsenic (0-2 GPa) and antimony (0-1.4 GPa) at ambient temperature ha s been investigated by means of As-75, Sb-121, and Sb-123 nuclear quadrupol e resonance (NQR). Previous investigations indicate that relaxation in thes e materials is dominated by magnetic nucleus-carrier interactions. NSLR mea surements therefore provide information on the carrier and Fermi surface pr operties. Our results indicate that antimony becomes more metallic under pr essure, while arsenic becomes less metallic. This is consistent with previo us experimental and theoretical results. The NQR measurements are, in parti cular, sensitive to changes in the s-wave character of the carriers. The NQ R results are compared with previous experimental and theoretical studies o f the electronic structure of the Group V semimetals.