31P NMR study of van der Waals antiferromagnets MnPS3 and FePS3

Abstract

Summary We report a 31P nuclear magnetic resonance (NMR) study of quasi-two-dimensional (2D) MnPS3 and FePS3 which have been identified as van der Waals antiferromagnets We have carried out the Knight shift measurement with the external field perpendicular and parallel to the honeycomb layers For each individual compound the temperature dependence of the Knight shift exhibits pronounced difference with the crystalline orientation The hyperfine field for each aligned direction in MnPS3 and FePS3 has been resolved The comparison of these results would help understand the effect of the dipolar coupling on the observed Knight shifts In addition the splitting of the 31P NMR resonance line found in the antiferromagnetic ordered state reveals the existence of the static internal field on the phosphorous site which has been employed to characterize the magnetic phase transition We further provided the strong evidence that the direction of the internal field is parallel to the ab plane in FePS3 since no splitting feature has been observed as the field is applied along the magnetic c* axis of FePS3

Date of Award	2020
Original language	English
Supervisor	Chin-Shan Lue (Supervisor)