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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.

physical review. b, condensed matter

Strong electronic correlations in a new class of Yb-based compounds: Yb<i>X</i><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(X=Ag,Au,Pd)

Strong electronic correlations in a new class of Yb-based compounds: YbXCu4(X=Ag,Au,Pd)