A 119Sn Mössabuer study of the magnetic to nonmagnetic transition in U(In1-x > Snx)3

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Abstract

The temperature and concentration dependence of the 119Sn Mössbauer spectrum has been measured for U(In1-xSnx)3. UIn3 has an antiferromagnetic transition at 91.5 K determined using both Mössbauer and specific heat measurements, and USn3 is a highly enhanced paramagnet. As Sn is substituted for In in UIn3, the Néel temperature TN (as determined using the temperature dependence of the magnetic susceptibility) is depressed and appears to go to zero between x = 0.4 and x = 0.5. However, the magnetic hyperfine field determined by Mössbauer spectroscopy persists to higher Sn concentration and appears to go to zero in the vicinity of x = 0.6. The difference in magnetic-nonmagnetic boundary is attributed to the presence of short-range order as the system approaches the magnetic instability. Short-range correlation in the vicinity of x = 0.6 appear to be responsible for the apparent heavy-fermion behavior previously reported for this system. In addition, the results of the 119Sn Mössbauer studies for U(In, Sn)3 are inconsistent with the magnetic structures previously proposed to explain neutron diffraction studies and a new magnetic structure is proposed which is consistent with both the neutron and Mössbauer studies.

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