Dimerization induced by the RKKY interaction

Abstract

We report the presence of spin dimerization in the ground state of the one dimensional Kondo lattice model at quarter filling. The emergence of this new phase of the Kondo lattice can be traced to the form of the RKKY interaction between the localized moments and provides the first example of dimerization induced indirectly by itinerant electrons. We propose this dimer ordering as the driving mechanism of the spin-Peierls phase observed in the quasi-one-dimensional organic compounds (Per)${}_2$M(mnt)${}_2$ (M=Pt, Pd). Moreover, this suggests that a richer phase diagram than the Doniach paradigm may be needed to accommodate the physics of heavy fermion materials.

4 pages, 6 figures

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• Transitions from small to large Fermi momenta in a one-dimensional Kondo lattice model
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• Re-entrant magnetic field induced charge and spin gaps in the coupled dual-chain quasi-one dimensional organic conductor Perylene${}_2$[Pt(mnt)${}_2$]
• Non-uniform phases in metals with local moments