نتایج جستجو برای: superexchange interaction
تعداد نتایج: 565959 فیلتر نتایج به سال:
We present the main features of the spin-orbital superexchange which describes the magnetic and optical properties of Mott insulators with orbital degrees of freedom. In contrast to the SU(2) symmetry of spin superexchange, the orbital part of the superexchange obeys the lower cubic symmetry of the lattice and is intrinsically frustrated. This intrinsic frustration and spin-orbital entanglement...
We have studied the superexchange interaction Jij in doped 2D cuprates. The AFM strongly depends on state of lattice a CuO2 layer surrounded by two LaO rock salt layers. In static U and D stripe nanostructure, homogeneous is impossible due to U/D/U… periodic sequence TN=0. dynamic ideal with nonlocal effects are restored. However, decreases exponential factor partial quenching. meaning transiti...
The ground and first excited state of two superconducting layers in interaction are studied considering two different coupling terms, one represented by the standard Josephson interaction, and one new, which is a superexchange pairing force between bilayer pairs. It is shown that a moderate-to strong Josephson interaction produces a low-lying collective state, pictured as an out-of-phase oscill...
Se p 20 07 Two - electron bound state formation in the t − J − U model for exchange - coupled planes
An anisotropic t−J −U model Hamiltonian is used to model electron behaviour in quasi-2d materials in the dilute limit, and as a highly simplified representation of the weakly coupled CuO2 planes of the high-Tc cuprates we model the very poor out-ofplane conductivity via the complete suppression of interplanar hopping. However, we do include the very weak interplanar superexchange, and are thus ...
The magnetic and electronic properties of single-molecule magnets are studied by X-ray absorption spectroscopy and X-ray magnetic circular dichroism. We study the magnetic coupling of ultrathin Co and Ni films that are epitaxially grown onto a Cu(100) substrate, to an in situ deposited submonolayer of TbPc2 molecules. Because of the element specificity of the X-ray absorption spectroscopy we ar...
High-temperature insulating ferrimagnetism is investigated in order to further reveal its physical mechanisms, as well as identify potentially important scientific and practical applications relative to spintronics. For example, double perovskites such as Sr2FeOsO6 and Ca2FeOsO6 are shown to have puzzling magnetic properties. The former is a low-temperature antiferromagnet while the latter is a...
We demonstrate that a simple phenomenological approach can be used to simulate electronic conduction in molecular wires under thermal effects induced by the surrounding environment. This "Landauer-Büttiker's probe technique" can properly replicate different transport mechanisms, phase coherent nonresonant tunneling, ballistic behavior, and hopping conduction. Specifically, our simulations with ...
We find through density functional theory that the two-dimensional MoTeI monolayer is intrinsically a ferromagnetic semiconductor. The magnetic states of are sensitive and can be significantly changed by biaxial strain. It fully spin polarized half-metallic or with tensile strain, while becomes antiferromagnetic when over 0.4% compressive strain applied. After phase transition, semiconducting c...
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