Proton NMR study of α-MnH 0.06

Abstract

Proton nuclear magnetic resonance (NMR) spectra and spin–lattice relaxation rates for the solid solution α-MnH 0.06 have been measured over the temperature range 11–297 K and the resonance frequency range 20–90 MHz. A considerable shift and broadening of the proton NMR line and a sharp peak of the spin–lattice relaxation rate are observed near 130 K. These effects are attributed to the onset of antiferromagnetic ordering below the Néel temperature T N≈130 K. The proton NMR line does not disappear in the antiferromagnetic phase; this suggests a small magnitude of the local magnetic fields at H-sites in α-MnH 0.06. The spin–lattice relaxation rate in the paramagnetic phase is dominated by the effects of spin fluctuations.