Abstract
The hyperfine fields at the tin sites in two manganese-tin alloys have been studied as a function of temperature to above the Curie points. In addition to the Zeeman splittings, observed and analyzed previously, a possible quadrupole interaction of about 27 Mc/sec is observed in ${\mathrm{Mn}}_{2}$Sn. In ${\mathrm{Mn}}_{4}$Sn the hyperfine field is small and negative, about -45 koe; in ${\mathrm{Mn}}_{2}$Sn it is large and positive, about +200 koe. As in the case of the pure ferromagnetic transition elements, it seems necessary to invoke a positive term associated with conduction-electron polarization and a negative one arising from core polarization to explain these results.
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