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Strong electronic correlations in a new class of Yb-based compounds: YbXCu4 (X=Ag,Au,Pd)
Abstract
A new series of heavy-electron Yb compounds YbXCu4 with X=Ag, Au, or Pd are reported which have electron effective masses as high as 60me, where me is the mass of the free electron. Whereas the compounds with X=Au and Pd order magnetically below 1 K, the compound with X=Ag is nonmagnetic. The magnetic susceptibility and specific heat of YbAgCu4 can be accounted for by the Bethe-ansatz solution of the Coqblin-Schrieffer impurity model without any adjustable parameters. © 1987 The American Physical Society.
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