Nuclear Magnetic Resonance Measurements in High Flat-top Pulsed Magnetic Field up to 40 T at WHMFC

TL;DR

This paper demonstrates successful nuclear magnetic resonance measurements in high flat-top pulsed magnetic fields up to 40 T, with improved stability and homogeneity, enabling advanced condensed matter physics research.

Contribution

It introduces a two-stage corrected FTPMF system and develops specialized NMR equipment suitable for pulsed magnetic field conditions, advancing high-field NMR capabilities.

Findings

Achieved stable and homogeneous 40 T pulsed magnetic field for NMR

Developed a Giga-Hz NMR spectrometer and sample probe for pulsed fields

Demonstrated $^{93}$Nb NMR measurements indicating near-mature field stability

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.