Nuclear Magnetic Resonance Measurements in High Flat-Top Pulsed Magnetic Field Up to 40 T at WHMFC

Abstract

The nuclear magnetic resonance (NMR) technique benefits from the high magnetic field not only due to the field-enhanced measurement sensitivity and resolution, but also because it is a powerful tool to investigate field-induced physics in modern material science. In this study, we successfully performed NMR measurements in the high flat-top pulsed magnetic field (FTPMF) up to 40 T. A two-stage corrected FTPMF with fluctuation of less than 10 mT and duration of longer than 9 ms was established. Besides, a Giga-Hz NMR spectrometer and a sample probe suitable for the pulsed-field condition were developed. Both free-induction-decay (FID) and spin-echo (SE) sequences were exploited for the measurements. The derived 93Nb NMR results show that the stability and homogeneity of the FTPMF reach an order of 102 ppm/10 ms and 102 ppm/10 mm3, respectively, which is approaching a degree of maturity for some researches on condensed matter physics.