Nuclear Magnetic Resonance Measurements in High Flat-top Pulsed Magnetic Field up to 40 T at WHMFC
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT(2023)
Abstract
Nuclear magnetic resonance (NMR) technique benefits from 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 high flat-top pulsed magnetic field (FTPMF) up to 40 T. A two-stage corrected FTPMF with fluctuation less than 10 mT and duration longer than 9 ms was established. Besides, a Giga-Hz NMR spectrometer and a sample probe suitable for pulsed-field condition were developed. Both free-induction-decay and spin-echo sequences were exploited for the measurements. The derived $^{93}$Nb NMR results show that the stability and homogeneity of the FTPMF reach an order of 10$^2$ ppm / 10 ms and 10$^2$ ppm / 10 mm$^3$ respectively, which is approaching a degree of maturity for some researches on condensed matter physics.
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Key words
Nuclear magnetic resonance, Magnetic fields, Magnetic field measurement, Superconducting magnets, Pulse measurements, Physics, Nonhomogeneous media, Flat-top pulsed magnetic field (FTPMF), high field, high stability, nuclear magnetic resonance (NMR), NMR spectrometer
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