A Wideband Spectrometer for NMR Studies

TL;DR

This paper presents a wideband NMR spectrometer operating between 200-900 MHz with high magnetic fields, designed for low-temperature studies of electronic-nuclear oscillations in antiferromagnets.

Contribution

It introduces a novel wideband spectrometer capable of high-field NMR measurements in the decimeter-wave range for low-temperature magnetic research.

Findings

Determined the critical field H_c for a reorientation transition in Mn3Al2Ge3O12.

Measured the 55Mn2+ NMR spectrum at 1.3 K.

Demonstrated the spectrometer's effectiveness for studying antiferromagnetic oscillations.

Abstract

The design of a wideband decimeter-wave (200 - 900 MHz) spectrometer with a magnetic induction of up to ~ 10 T is described. This spectrometer is intended for studying electronic - nuclear oscillations in antiferromagnets at low temperatures (4.2 - 1.3 K). Critical field H_c = 2.5 +/- 0.3 T of a reorientation transition in a noncollinear antiferromagnet Mn3Al2Ge3O12 at temperature T = 1.3 K was determined from a 55Mn2+ NMR spectrum.