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Possible Low-Temperature Strongly Correlated Electron Behavior from Multipole Fluctuations in PrMg3 with Cubic Non-Kramers Γ3 Doublet Ground State

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  • Possible Low-Temperature Strongly Correlated Electron Behavior from Multipole Fluctuations in PrMg3 with Cubic Non-Kramers √3 Doublet Ground State
  • Possible Low Temperature Strongly Correlated Electron Behavior from Multipole Fluctuations in PrMg3 with Cubic Non Kramers 3 Doublet Ground State

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Abstract

The magnetic and thermodynamic properties of PrMg3 single crystals were investigated based on the magnetic susceptibility χ(T) and the specific heat CP(T). An observed broad anomaly in CP(T) with a peak ∼1.8 J/(mol K) at 0.9 K, together with Van-Vleck-like behavior of χ(T), indicates that the low-T properties are ascribed to the multipole (quadrupole O20 and O22, and octupole Txyz) degrees of freedom of a nonmagnetic, non-Kramers Γ3 doublet ground state in the cubic crystalline electric field of Pr3+. The low-T CP(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 TK=1.3 K, including its weak external-field dependence. No evidence for a cooperative phase transition was detected down to 0.54 K in CP(T), suggesting that the Γ3 multipole degrees of freedom are quenched at low T by forming a strongly correlated electronic state through the hybridization with conduction electrons.

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