EXPLORING THE OXYGEN ORDER IN Hg -1223 AND Hg -1201 BY ~(199)Hg MAS NMR

摘要

We demonstrate the use of a high-resolution solid-state fast (45 kHz) magic angle spinning (MAS) NMR for mapping the oxygen distribution in Hg-based cuprate superconductors. We identify observed three peaks in ~(199)Hg spectrum as belonging to the different chemical environments in the HgO_δ layer with no oxygen neighbors, single oxygen neighbor, and two oxygen neighbors. We discuss observed differences between Hg-1201 and Hg-1223 materials.