Abstract
The 151 Eu and 153 Eu nuclear magnetic resonances (NMR) in the ferromagnetic state of EuSe were measured using a single-crystal sphere by the steady-state method over an applied magnetic field range of 0.65–2.1 T at 1.3 K. The 151 Eu NMR signal is a single line, and the variation of its linewidth with applied field is quantitatively interpreted in terms of a line-broadening mechanism which is caused by the Suhl-Nakamura interaction. On the other hand, the 153 Eu NMR signal exhibits quadrupole splittings in high field as has been reported previously, and the observed complicated lineshape in low field is interpreted in terms of the same line-broadening mechanism of the quadrupole-split component lines. The observed remarkable line-broadening in low field is attributed to magnon softening along <111> directions in this compound.
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