New dense Kondo systems Ce3Pd20Ge(Si)(6) and related compounds Sm(Yb)(3)Pd20Ge(Si)(6)статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The electrical and magnetic properties of a new cubic system Ln3Pd20X6 (Ln = Ce, Sm, Yb; X = Si, Ge) have been studied. The electrical resistivity ρ versus temperature shows a minimum at ∼ 50 K for Ce3Pd20Si6, and at ∼ 10 K for Ce3Pd20Ge6. Below these temperatures ρ(T) follows a logarithmic law down to 4.2 K. In Ce3Pd20Si6 the thermal behavior of the magnetic moment displays an antiferromagnetic anomaly at approximately 50–60 K and marked ‘superparamagnetic’ properties on further cooling. To explain the unusual magnetic behavior of Ce3Pd20Si6 a model of ‘molecular’ magnetism is suggested for one of two cerium sublattices. Another cerium subsystem is likely to respond for Kondo anomalies. In contrast with cerium compounds, the samarium and ytterbium homologues display normal metallic behavior with a nonmagnetic ground state down to 4.2 K.