Electronic-cluster model of yttrium iron garnets

Wojciechowski, Ryszard; Lehmann-Szweykowska, A.; Micnas, R.; Gehring, G. A.; Wigen, P. E.

doi:10.1103/physrevb.69.214434

Cited by 8 publications

(11 citation statements)

References 17 publications

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“…The outer blocks are coupled to non-interacting metallic electrodes in a serial configuration. As shown earlier, an extra charge, localised temporarily at one of the outer blocks, can induce a change of the exchange interaction between the spins of the outer and middle clusters from the Anderson antiferromagnetic to ferromagnetic [1]. This means that the chain becomes actually asymmetric.…”

Section: Introductionmentioning

confidence: 98%

“…i = 1, 2, 3 labels the ionic blocks and µ = 1, 2, 3, 4 labels their respective eigenstates [1][2][3]. In our convention, m s is the spin number projection, attached to the states µ = 1, 3, whereas −m s is the spin number projection of µ = 2, 4.…”

Section: Cluster Energy Structure and The Currentmentioning

confidence: 99%

“…[3][4][5]). Consequently, the truncated Hamiltonian of the chain coupled to the metallic electrodes can be rewritten in a simple quadratic form [1]:…”

Section: Cluster Energy Structure and The Currentmentioning

confidence: 99%

“…The method, employed throughout this paper [1,2], is designed for such systems, whose natural building units are ionic clusters. This is true about many semiconducting compounds with permanent magnetic moments, but especially about the transition metal oxides and/or manganites.…”

Section: Introductionmentioning

confidence: 99%

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Spin and Charge Current in a Short Semiconducting Chain of Paramagnetic Ionic Blocks

2009

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We deal with the electric current flowing through a short chain of paramagnetic ionic blocks, coupled to metallic electrodes in the serial configuration. An original three-band Hubbard-Anderson Hamiltonian is diagonalised at the level of the single ionic block. A minimal but sufficient set of the latter's four hybridised eigenstates serves as a basis for the determination of the time-ordered temperature-dependent matrix Green functions, in terms of which all the current-voltage (I-V ) characteristics can be expressed provided the coupling to the electrodes is weak. The separation of the opposite-spin contributions to the electric current and, consequently, the spin current from the left to right electrode can result from the on-site Coulomb repulsion term of Hubbard-Anderson Hamiltonian, with no spin polarisation at the electrodes, but with the Zeeman-like coupling of the centre to either a molecular or an external magnetic field.

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Section: Introductionmentioning

confidence: 98%

Section: Cluster Energy Structure and The Currentmentioning

confidence: 99%

“…[3][4][5]). Consequently, the truncated Hamiltonian of the chain coupled to the metallic electrodes can be rewritten in a simple quadratic form [1]:…”

Section: Cluster Energy Structure and The Currentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spin and Charge Current in a Short Semiconducting Chain of Paramagnetic Ionic Blocks

2009

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“…This case was discussed at length in our previous papers and the Reader is referred to them for more details [3,4]. The metallic electrodes are described by a Hamiltonian of non-interacting electron gas:…”

Section: Introductionmentioning

confidence: 99%