Dynamics of the Singlet-Triplet System Coupled with Conduction Spins -- Application to Pr Skutterudites

Abstract

Dynamics of the singlet-triplet crystalline electric field (CEF) system at finite temperatures is discussed by use of the non-crossing approximation. Even though the Kondo temperature is smaller than excitation energy to the CEF triplet, the Kondo effect appears at temperatures higher than the CEF splitting, and accordingly only quasi-elastic peak is found in the magnetic spectra. On the other hand, at lower temperatures the CEF splitting suppresses the Kondo effect and inelastic peak develops. The broad quasi-elastic neutron scattering spectra observed in PrFe_4P_{12} at temperatures higher than the quadrupole order correspond to the parameter range where the CEF splittings are unimportant.

arXiv comment16 pages, 12 figures, 1 table

References in corpus (6)

• Unusual behaviors in the transport properties of REFe${}_4$P${}_{12}$ (RE: La, Ce, Pr, and Nd)
• Thermodynamical Study on the Heavy-Fermion Superconductor PrOs4Sb12: Evidence for Field-Induced Phase Transition
• Anomalous heavy-fermion and ordered states in the filled skutterudite PrFe4P12
• The Crystal Field Potential of PrOs4Sb12: Consequences for Superconductivity
• Theory of Crystalline Electric Field and Kondo Effect in Pr Skutterudites
• Non-Fermi Liquid Behavior of U-impurity with $f^2$-Singlet Ground State

Cited by in corpus (9)

• Theory of Ultrasonic Dispersion in Local Phonon Systems Coupled with Conduction Electrons
• Electronic Order with Staggered Kondo and Crystalline Electric Field Singlets
• Skutterudite Results Shed Light on Heavy Fermion Physics
• Electronic Orders Induced by Kondo Effect in Non-Kramers f-Electron Systems
• Hybridization and multipole orders of 4f electrons in Pr skutterudites
• Crystal field excitation in the chiral helimagnet YbNi${}_3$Al${}_9$
• Continuous-Time Quantum Monte Carlo Approach to Singlet-Triplet Kondo Systems
• Excitonic Bound State in the Extended Anderson Model with c-f Coulomb Interaction
• Self-Consistent Perturbation Theory for Thermodynamics of Magnetic Impurity Systems