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

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

2006-02-16

arxiv.org/abs/cond-mat/0602360v3

Phys. Rev B 75, 014435 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures; final version to appear in PRB

Scientific paper

10.1103/PhysRevB.75.014435

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.

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