Heavy electrons from Hund's rule and short-range Antiferromagnetism

Abstract

We investigate the one-dimensional ferromagnetic Kondo lattice in the hole-rich region. Of interest to us is the intermediate situation where the ferromagnetic Kondo coupling (Hund's coupling) is comparable to the electron bandwidth. The forced alignment favors triplet states whereas singlet states enter in a quite low-density regime. The direct antiferromagnetic exchange between the core spins is assumed to still prevail over the double exchange. We discuss a solvable limit showing that short-range antiferromagnetism in the spin array will affect the coherent propagation of triplets, i.e., turns a light triplet onto a heavy singlet, resulting in a heavy electron ground state.

arXiv comment5 pages, 2 figures; final version to appear in PRB

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Cited by in corpus (3)

• Magnetic Topological Kagome Systems
• Effective Hamiltonian of Three-orbital Hubbard Model on Pyrochlore Lattice: Application to LiV_2O_4
• LiV2O4: Hund-Assisted Orbital-Selective Mottness