CUPROUS-OXIDE MANOMETER FOR HIGH-PRESSURE MAGNETIC-RESONANCE EXPERIMENTS

We present a manometer designed to measure pressures of 1-20 kbar in temperatures between 4-300 K in cylinder-piston type chambers, with an accuracy of approximately 100 bar. The manometer is based on pressure-dependent zero-field Cu-63 nuclear quadrupole resonance frequency corresponding to \+/- 3/2] <-> \ +/- 1/2] transition in Cu2O. The nuclear quadrupole resonance frequency nu(Q) varies linearly with pressure and its temperature dependence is adequately explained by a model of lattice vibrational modes in O-Cu-O bonds. This manometer is particularly convenient for zero or high-field magnetic resonance experiments.