The underscreened Kondo lattice model applied to heavy fermion uranium compounds

Details The underscreened Kondo lattice model applied to heavy fermion uranium compounds The underscreened Kondo lattice model applied to heavy fermion uranium compounds

2007-11-29

arxiv.org/abs/0711.4765v1

Physical Review B 76, 125101 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.76.125101

We present theoretical results for the underscreened Kondo lattice model with localized S=1 spins coupled to a conduction band through a Kondo coupling, $J_K$, and interacting among them ferromagnetically. We use a fermionic representation for the spin operators and expand the Hamiltonian in terms of bosonic fields. For large values of $J_K$, we obtain a ferromagnetically ordered solution and a Kondo regime with a Kondo temperature, $T_K$, larger than the Curie temperature, $T_C$. This finding suggests a scenario for a coexistence of Kondo effect and ferromagnetic order. In some uranium compounds, like $UTe$ or $UCu_{0.9}Sb_{2}$, this kind of coexistence has been experimentally observed: they order ferromagnetically with a Curie temperature of order $T_C \sim 100K$ and exhibit a Kondo behavior for $T > T_C$. The proposed underscreened Kondo lattice model accounts well for the coexistence between magnetic order and Kondo behavior and yields to a new ``ferromagnetic Doniach diagram''.

Affiliated with

Also associated with

No associations

Rating

The underscreened Kondo lattice model applied to heavy fermion uranium compounds does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The underscreened Kondo lattice model applied to heavy fermion uranium compounds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The underscreened Kondo lattice model applied to heavy fermion uranium compounds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-46266