Magnetic and transport properties of the one-dimensional ferromagnetic Kondo lattice model with an impurity

Abstract

We have studied the ferromagnetic Kondo lattice model (FKLM) with an Anderson impurity on finite chains with numerical techniques. We are particularly interested in the metallic ferromagnetic phase of the FKLM. This model could describe either a quantum dot coupled to one-dimensional ferromagnetic leads made with manganites or a substitutional transition metal impurity in a MnO chain. We determined the region in parameter space where the impurity is empty, half-filled or doubly-occupied and hence where it is magnetic or nonmagnetic. The most important result is that we found, for a wide range of impurity parameters and electron densities where the impurity is magnetic, a singlet phase located between two saturated ferromagnetic phases which correspond approximately to the empty and double-occupied impurity states. Transport properties behave in general as expected as a function of the impurity occupancy and they provide a test for a recently developed numerical approach to compute the conductance. The results obtained could be in principle reproduced experimentally in already existent related nanoscopic devices or in impurity doped MnO nanotubes.

8 pages, 7 figures, to appear in Physical Review B

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• Oxide spintronics
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Nanospintronics with carbon nanotubes
• Anderson impurity in the one-dimensional Hubbard model on finite size systems
• The Ising phase in the J1-J2 Heisenberg Model
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Cited by in corpus (1)

• Numerical study of finite size effects in the one-dimensional two-impurity Anderson model