Possible Low-Temperature Strongly Correlated Electron Behavior from Multipole Fluctuations in PrMg_3 with Cubic Non-Kramers Γ_3 Doublet Ground State(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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The magnetic and thermodynamic properties of PrMg_3 single crystals were investigated based on the magnetic susceptibility X (T) and the specific heat C_p (T). An observed broad anomaly in C_p(T) with a peak〜1.8 J/(mol K) at 0.9K, together with Van-Vleck-like behavior of X(T), indicates that the low-T properties are ascribed to the multipole (quadrupole O_<20> and O_<22>, and octupole T_<xyz>) degrees of freedom of a nonmagnetic, non-Kramers Γ_3 doublet ground state in the cubic crystalline electric field of Pr^<3+>. The low-T C_p (T) anomaly, however, is not described in terms of the two-channel Kondo model, but is more similar to that for the single-channel Kondo model with the Kondo temperature T_K=1.3K, including its weak external-field dependence. No evidence for a cooperative phase transition was detected down to 0.54K in C_p (T) suggesting that the Γ_3 multipole degrees of freedom are quenched at low T by forming a strongly correlated electronic state through the hybridization with conduction electrons.
社団法人日本物理学会の論文
2006-07-15