Abstract
Electrical resistivity ρ(T) measurements on polycrystalline samples of theCe (Pt1−xNix)2Si2 system exhibit dense Kondo behaviour for alloys with . The temperature at which a maximum appears inρ(T) shiftsfrom Tmax = 65 K for x = 0 to Tmax = 290 K for x = 0.6 as the system evolves towards the intermediate-valence regime for theCeNi2Si2 compound. At lowtemperatures the Ce (Pt1−xNix)2Si2 alloysshow a Fermi liquid T2 contribution to ρ(T) below thecoherence temperature Tcoh. It is observed that , with a transition that takes place from a dense Kondo regime ofTK<TCF () to a regime of TK>TCF (). TK () and TCF denote the Kondo and crystalline electric field splitting,EF and ER are the Fermi and the Abrikosov–Suhl resonance energies andj denotes the total angular momentum. An electronic Grüneisen parameter value of 19 has been obtained for the alloy system which is in reasonable agreement withΩ = 28 found frompressure studies on CePt2Si2. It is argued that volume effects are mainly responsible for the hybridization in theCe (Pt1−xNix)2Si2 system and application of the compressible Kondo lattice model toTmax datayields |JN(EF)| = 0.309 ± 0.008,where J is the on-site exchange interaction between conduction electrons and the localized 4f spin andN(EF) is the densityof states at EF.
Published Version
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