Interplay of crystal field structures with $f^2$ configuration to heavy fermions

Abstract

We examine a relevance between characteristic of crystal field structures and heavily renormalized quasiparticle states in the $f^0$-$f^1$-$f^2$ Anderson lattice model. Using a slave-boson mean-field approximation, we find that for $f^2$ configurations two or three quasiparticle bands are formed near the Fermi level depending on the number of the relevant $f^1$ orbitals in the $f^2$ crystal field ground state. The inter-orbital correlations characterizing the crystal field ground state closely reflect in inter-band residual interactions among quasiparticles. Particularly in the case of a singlet crystal field ground state, resulting residual antiferromagnetic exchange interactions among the quasiparticles lead to an anomalous suppression of the quasiparticle contribution of the spin susceptibility, even though the quasiparticle mass is strongly enhanced.

8 pages, 7 color figures, in JPSJ style

Cited by in corpus (7)

• On the Hidden Order in URu${}_2$Si${}_2$ --- Antiferro Hexadecapole Order and its Consequences
• Magnetically Robust Non-Fermi Liquid Behavior in Heavy Fermion Systems with f^2-Configuration: Competition between Crystalline-Electric-Field and Kondo-Yosida Singlets
• Competing Kondo Effects in Non-Kramers Doublet Systems
• Competition between Quadrupole and Magnetic Kondo Effects in Non-Kramers Doublet Systems
• Strange-metal behavior without fine-tuning in PrV2Al20
• Criterion for weak spin-orbit coupling in heavy-fermion superconductivity: A numerical renormalization-group study
• Slave Boson Analysis on $f^2$-Configuration System with ${\Gamma }_1$ Singlet Crystalline-Electric-Field Ground State in Cubic Symmetry