10 GPa-Class High-Pressure NMR Technique Realized by the New Cell with Improved Space Efficiency

Abstract

  We describe our recent progress in high-pressure nuclear magnetic resonance (NMR) technique, which extends the range of practical NMR experiments to 10 GPa-class. The new opposed-anvil type cell has significantly large sample space, though the whole clamp cell size is small enough to put within superconducting magnets or fridges. We also show other new techniques on loading of argon pressure transmitting medium, pressure determination, and wiring of electrodes. The application on a pressure-induced superconductivity of SrFe₂As₂ has demonstrated a remarkable advantage brought by the combination of the clean crystal, pressure control, and spectroscopy.