Appearance of a new coherent Kondo state by In substitution for Cu in CeCu6

Substitution Study on the Coherent Kondo State in CeCu5In

“…In agreement with the previous finding [3], the electrical resistivity of CeCu5In reveals features characteristic of coherent Kondo effect (see Fig. 2).…”

“…2). The broad maximum in p(T), occurring at about 25 Κ, is consistent with ΤK 28 K, as derived from the specific heat data [3], and with |Ο = 48 Κ, found in the magnetic measurements. In order to estimate the magnetic contribution to the resistivity of CeCu5 In it was assumed that the phonon contribution ρph(T) can be approximated by the temperature-dependent resistivity of its isostructural lanthanum counterpart.…”

“…This is in contrast to the specific heat results [3], which revealed antiferromagnetism in CeCu 4.5 In 1.5 below 2.2 Κ. Yet, with rising x the magnetization measured at 1.7 Κ in a field of 5 Τ considerably increases, and σ(T) of CeCu4.4In1.6 is strongly curvilinear (see the inset to Fig.…”

“…In all the alloys CeCu6-x Ιnx but CeCu5 Ιn two crystallographic sites have mixed Cu/In occupancy. In the latter compound only there occurs a full atom order and owing to that a coherent Kondo behavior develops [3]. In this paper we report on the destruction of coherent state upon Cu → In exchange.…”

“…The discovery of a non-Fermi liquid behavior in the series CeCu 6-x Αux [2] has focused attention on other solid solutions of this type. Recently, Kasaya et al [3] reported on the alloys CeCu 6 -x Ιnx with 0 ≤ x ≤ 1.75, claiming that they are isostructural to CeCu6. Contrary to that, we showed before [4] that CeCu 4.38In1.62 crystallizes with its own structure type, which is a ternary derivative of the CeCu6-type.…”