Abstract
The physical properties including magnetic susceptibility, magnetization, specific heat, and dynamic susceptibility χ″ (E) are reported for single crystals of the cubic UM2 Zn20 (M=Co,Rh) materials. Maxima in the thermodynamic data at Tmax ∼10 K for both compounds and a broad peak in χ″ (E) at 5 K in UCo2 Zn 20 of width Γ=5 meV indicate a heavy-fermion state characterized by a Kondo temperature TK ∼20-30 K arising from weak hybridization of f - and conduction-electron states. Anderson impurity model fits to the data in the Kondo limit including crystalline electric-field effects corroborate an ionic-like uranium electronic configuration in UM 2 Zn20.
Original language | English |
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Article number | 115120 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 78 |
Issue number | 11 |
DOIs | |
State | Published - Sep 29 2008 |
Externally published | Yes |