Nuclear magnetic resonance study of magnetic properties of ErMn6Sn6ErMn6Sn6

We have carried out Mn55 and Er167 NMR measurements on ErMn6Sn6ErMn6Sn6 at 4.2 K. The zero-field NMR spectrum of Mn observed in the frequency range 190–280 MHz is very complex due to anisotropic hyperfine interaction. It consists of the single line around 245.5 MHz and the five equidistant lines in the range 250–270 MHz. For the Er167 NMR, the resonance frequency of the central line is 955 MHz, and the frequency separation between the adjacent lines split by the electric quadrupole interaction is ∼129MHz. The hyperfine field analysis shows that the magnetic moments are 8.9μB for Er and 2.2μB for Mn at 4.2 K in the ferrimagnetically ordered state.