Unusual Low-Temperature Magnetization of a Cubic Γ_3 Non-Kramers Doublet Ground State Compound PrMg_3-Evidence of a Hybridization Effect(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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Magnetizations of single crystals of cubic PrMg_3 with a Γ_3 non-Kramers doublet ground state have been examined at very low temperatures down to 60mK in magnetic fields up to 8.5T. No evidence of a long-range order is obtained. Instead, the magnetic susceptibility for both [001] and [111] directions continuously increases on cooling below 3K where the system is well in the Van-Vleck paramagnetic regime, followed by a steep rise due to Pr nuclear Curie law below 〜0.2K. Subtracting the nuclear contribution from the total magnetization yields a -log T (1≤T≤10K) or a-√<T> (0.3≤T≤2.5K) dependence of the 4f-electronic susceptibility. We argue that a possible random site exchange effect in this Heusler type compound is not the origin of the unusual increase of the susceptibility. Our observations strongly suggest the presence of a hybridization effect between Pr 4f and conduction electrons.
社団法人日本物理学会の論文
2009-03-15