119Sn NMR Studies of the Heavy-Electron Compound U3Au3Sn4

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  • <SUP>119</SUP>Sn NMR Studies of the Heavy-Electron Compound U<SUB>3</SUB>Au<SUB>3</SUB>Sn<SUB>4</SUB>
  • 119Sn NMR Studies of the Heavy Electron

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We have performed the 119Sn NMR, magnetic susceptibility, electrical resistivity and Hall effect measurements on a recently discovered heavy-electron compound U3Au3Sn4. The system is found to be in the incoherent Kondo state above about 40 K. Even under the presence of a large residual resistivity, the onset of coherence in the electronic system becomes evident below about 20 K in both ρ(T) and RH(T), but it does not manifest itself in T1−1(T). Observed almost T-independent T1−1(T) below about 20 K, however, is not considered as due to development of strongly q-dependent spin fluctuation (SF), since an analysis in terms of the Wilson ratio rather suggests a localized character of the SF.

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