Evolution of ferromagnetism from the heavy fermion state in CePtxSi (0.7 ≤ × ≤ 1.0)

✍ Scribed by R.N. Shelton; P. Klavins; W.H. Lee; H.C. Ku

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 141 KB
• Volume: 153-155
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(88)90676-4

✦ Synopsis

Ten polycrystalline samples in the isostructural series CePtxSi (0.7 <_ x _< 1.0) have been synthesized and studied by magnetization measurements and transport experiments. The stoichiometric compound CePtSi, which crystallizes in the LaPtSi-type structure (I41md), has been shown to be a heavy fermion and coherent Kondo lattice compound with a large coefficient of the electronic specific heat q ~ 800 mJ/mol K 2. Introducing vacancies on the Pt sublattice affects the valence state of Ce and the strength of the RKKY interaction, resulting in magnetic order for x < 0.96. The relative strengths of the interactions that give rise to the heavy-fermion state and magnetic order are considered.