Nuclear Magnetic Resonance Study of Ferromagnetic Mn1−xCuxSb

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Abstract
The effect of introduction of Cu atoms in small quantities into a matrix of MnSb has been studied by the zero‐field Nuclear Magnetic Resonance (NMR) technique. The compounds studied are Mn 0.98 Cu 0.02 Sb , Mn 0.97 Cu 0.03 Sb and Mn 0.96 Cu 0.04 Sb , At 300 K, all materials give a group of five lines which are the quadrupolar split 55Mn resonance lines. The frequencies of these lines are about 1–1.5MHz below the corresponding 55Mn resonance lines in MnSb . The introduction of Cu atoms which are assumed to occupy the Mn sites in the NiAs type MnSb lattice causes a decrease in the exchange bonds between the Mn atoms and consequently causes a reduction in the hyper‐fine field experienced by the 55Mn nuclei. A broad line with a peak around 231 MHz in Mn 0.98 Cu 0.02 Sb and at 233.5 MHz in Mn 0.96 Cu 0.04 Sb is assigned to unresolved satellite lines caused by the Mn atoms with Cu atoms in the neighbourhood.

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