Abstract
The magnetic properties of ε-FeSi are studied by Si29 nuclear magnetic resonance spectra and spin-lattice relaxation, at different magnetic fields, up to 15 T. For T⩾200 K, an asymmetric central line with a satellite-like structure is observed, having a width linearly increasing with the field and a shift proportional to the magnetic susceptibility. Below 200 K, a progressive broadening of the central line is detected on cooling, indicating an inhomogeneous distribution of local magnetization. The spin-lattice relaxation, measured across the spectrum follows a law of the form T1−1∝K2T, with K corresponding to the shift of the different isocromates. The results are discussed in the light of the spin-fluctuations theory for exchange-enhanced semiconductors.
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