Electronic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Eu</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>in the ferromagnetic regime: Half-metal versus semiconductor

We propose a novel interaction-based route to half-metal state for interacting electrons on two-dimensional lattices. Magnetic field applied parallel to the lattice is used to tune one of the spin densities to a particular commensurate with the lattice value in which the system spontaneously `locks in' via van Hove enhanced density wave state. Electrons of opposite spin polarization retain their metallic character and provide for the half-metal state which, in addition, supports magnetization plateau in a finite interval of external magnetic field. Similar half-metal state is realized in the finite-U Hubbard model on a triangular lattice at 1/3 of the maximum magnetization.Comment: 7 pages, 8 figure

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“…[14,29], as well as in cold atom systems [30,31] where it may be easier to achieve the required spin population imbalance.…”

Section: Electronsmentioning

confidence: 99%

Half-metallic magnetization plateaux

Hao

Starykh

2013

Phys. Rev. B

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“…Therefore, it should represent a reasonable starting point for the description of ferromagnetic semiconductors. The ISA approach has already been applied in model studies 9 and to real substances 48 . For a detailed account of the decoupling procedure and an extensive discussion of the reliability of this self-energy we refer the reader to Ref.…”

Section: A the Concentrated Kondo-lattice Modelmentioning

confidence: 99%

Carrier-induced ferromagnetism in diluted local-moment systems

Tang

Nolting

2007

Phys. Rev. B

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The electronic and magnetic properties of concentrated and diluted ferromagnetic semiconductors are investigated by using the Kondo lattice model, which describes an interband exchange coupling between itinerant conduction electrons and localized magnetic moments. In our calculations, the electronic problem and the local magnetic problem are solved separately. For the electronic part an interpolating self-energy approach together with a coherent potential approximation (CPA) treatment of a dynamical alloy analogy is used to calculate temperature-dependent quasiparticle densities of states and the electronic self-energy of the diluted local-moment system. For constructing the magnetic phase diagram we use a modified RKKY theory by mapping the interband exchange to an effective Heisenberg model. The exchange integrals appear as functionals of the diluted electronic self-energy being therefore temperature-and carrier-concentration-dependent and covering RKKY as well as double exchange behavior. The disorder of the localized moments in the effective Heisenberg model is solved by a generalized locator CPA approach. The main results are: 1) extremely low carrier concentrations are sufficient to induce ferromagnetism; 2) the Curie temperature exhibits a strikingly non-monotonic behavior as a function of carrier concentration with a distinct maximum; 3) TC curves break down at critical n/x due to antiferromagnetic correlations and 4) the dilution always lowers TC but broadens the ferromagnetic region with respect to carrier concentration.

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“…The same spirit is presented in the electron-hole liquid theory [147], which is used to explain the ground state of ScN. Using a novel many-body theory and Kondo lattice model (s-f model), Kreissl and Nolting predicted that the decreasing magnetic order induces a transition from half-metallic to semiconducting behavior in EuB 6 [157]. If this can be confi rmed experimentally, then similar examples should be found among the rare-earth monopnictides.…”

Section: Metal-insulator Transitionsmentioning

confidence: 99%

Electronic, Magnetic and Transport Properties of Rare‐Earth Monopnictides

Duan¹,

Sabirianov²,

Mei³

et al. 2007

ChemInform

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The electronic structures and magnetic properties of many rare-earth monopnictides are reviewed in this article. Possible candidate materials for spintronics devices from the rare-earth monopnictide family, i.e. high polarization (nominally half-metallic) ferromagnets and antiferromagnets, are identifi ed. We attempt to provide a unifi ed picture of the electronic properties of these strongly correlated systems. The relative merits of several ab initio theoretical methods, useful in the study of the rare-earth monopnictides, are discussed. We present our current understanding of the possible half-metallicity, semiconductor-metal transitions, and magnetic orderings in the rare-earth monopnictides. Finally, we propose some potential strategies to improve the magnetic and electronic properties of these candidate materials for spintronics devices.

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Electronic properties ofEuB6in the ferromagnetic regime: Half-metal versus semiconductor

Cited by 24 publications

References 25 publications

Half-metallic magnetization plateaux

Half-metallic magnetization plateaux

Carrier-induced ferromagnetism in diluted local-moment systems

Electronic, Magnetic and Transport Properties of Rare‐Earth Monopnictides

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