U-238 Mossbauer study of UPt3

Using Mossbauer spectroscopy, the magnetic properties of UPt3 have been inv estigated. The Mossbauer spectra in UPt3 shows that the paramagnetic hyperf ine interaction is similar to that in UPd2Al3 and URu2Si2. The quadrupole i nteraction has been observed in the measured temperature range from 2.8 to 125 K. Around T-chi max, at which the magnetic susceptibility shows a maxim um, the spectrum is the sharpest. Although the temperature dependence of th e spectra in UPt3 is different from those in UPd2Al3 and URu2Si2, the obtai ned results suggest that the paramagnetic hyperfine interaction is related to the formation of the heavy fermion state in the 5f-electron system. (C) 2001 Elsevier Science B.V. All rights reserved.