Spin Wave
Mostrando 13-24 de 50 artigos, teses e dissertações.
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13. Calculations of the atomic and the electronic structures of 4d-transition-metal nitrides
A systematic study of the zinc-blende-type 4d-transition-metal nitrides, which still need to be synthesized, is carried out by means of spin-polarized first-principles full-potential-linearized-augmented-plane- wave calculations using the local spin density approximation. In particular, lattice constants, bulk moduli, band structures and density of states ar
Brazilian Journal of Physics. Publicado em: 2006-06
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14. Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets
Single differential cross-sections for transfer-loss (TL) leading to the production of O5+(1s2s³S)nl4L states were computed for 0.2-1.2 MeV/u collisions of O5+(1s²2s) ions with He and H2 targets. At these collision energies, 1s loss is significant and electron transfer to n = 3-4 levels is dominant. Furthermore, due to spin conservation, quartet states can
Brazilian Journal of Physics. Publicado em: 2006-06
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15. Suscetibilidades de carga e spin para uma superfície de fermi chata bidimensional
In this work we investigate the charge and spin instabilities of a two-dimensional model (d=2) of strongly interacting electrons in the presence of a at Fermi surface (FS) by using the renormalization group theory (RG). Bearing in mind the strong electronic repulsions in the cuprates superconductors, we try to relate our model to the repulsive Hubbard model
Publicado em: 2006
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16. Origem dos momentos magnéticos localizados em ligas de cromo com metais de transição por oscilações de Friedel
As propriedades magnéticas fundamentais do cromo e de suas ligas de Cr(1x)Nb(x) e Cr(1x)V(x), foram investigadas com o objetivo de melhorar a compreensão sobre a natureza das ondas de densidade de spin (spin-density-wave). Foi determinada a fronteira entre as fases AF1 e AF2 nas ligas Cr(1x)Nb(x) em função da concentração de nióbio. Utilizando tecnica
Publicado em: 2006
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17. SPIN AND CORRELATION EFFECTS IN NANOSCOPIC TRANSPORT / EFEITOS DE SPIN E CORRELAÇÃO EM TRANSPORTE NANOSCÓPICO
We investigated spin polarized transport properties through a quantum dot connected with two terminals. An electric current that circulates in our system can have its polarization modulated with an external potential that controls the spin orbit coupling (Rashba effect). We studied the effect of spin polarization n a transistor constituted by a quantum dot w
Publicado em: 2005
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18. \ 58 ANTPOT. Co\ : estudo de um núcleo ímpar-ímpar na camada pf / 58Co: study of an odd-odd nucleus in the pf shell
The excited states in the doubly odd nucleus \ ANTPOT. 58 CO\ have been studied using inbeam gama-ray spectroscopy. The \ ANTPOT. 58 CO\ nucleus has been produced with the fusionevaporation reaction \ ANTPOT. 51 V\ (ANTPOT. 10 B\ , p2n) at 33 MeV bombarding energy, using the SMV Pelletron accelerator of the University of São Paulo. Gamrna-gamma-charged part
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2004
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19. Spin-1 particle in the light-front approach
The electromagnetic current of spin-1 composite particles does not transform properly under rotations if only the valence contribution is considered in the light-front model. In particular, the plus component of the current, evaluated only for the valence component of the wave function, in the Drell-Yan frame violates rotational symmetry, which does not allo
Brazilian Journal of Physics. Publicado em: 2004-09
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20. Diluted magnetic Ga1-xMn xN alloys: a first-principles study
The utilization of the quantum properties of the electron spin wave function will allow the development of a new class of devices. The problem is still controversial and unsettled, even qualitatively, especially for concentrated spin systems such as 3d metals and their alloys. The variety of crystal structures of 3d metals makes difficult the direct comparis
Brazilian Journal of Physics. Publicado em: 2004-06
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21. Titanium impurities in silicon, diamond, and silicon carbide
We carried a theoretical investigation on the electronic and structural properties of titanium impurities in silicon, diamond, and silicon carbide. The calculations were performed using the spin-polarized full-potential linearized augmented plane wave method in the supercell approach. The atomic configurations and transition and formation energies of isolate
Brazilian Journal of Physics. Publicado em: 2004-06
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22. Electronic properties of isolated nickel in diamond
Isolated nickel impurities in diamond have been investigated using the spin-polarized full-potential linearized augmented plane wave total energy method. The electronic and atomic structures, symmetries, transition energies, and formation energies of substitutional and interstitial Ni impurities in diamond were computed. The results were discussed in the con
Brazilian Journal of Physics. Publicado em: 2004-06
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23. A first principles investigation of mercuric iodide: bulk properties and intrinsic defects
We carried a theoretical investigation on the properties of mercuric iodide in the red tetragonal crystalline phase, and its respective intrinsic defects. Our calculations were performed using the ab initio spin-polarized full-potential linearized augmented plane wave method, and taking into account full atomic relaxation. The results on the structural, elec
Brazilian Journal of Physics. Publicado em: 2004-06
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24. Impact of the recent Jefferson lab data on the structure of the nucleon
The simultaneous fit of proton ratio m pG Ep/G Mp, qF2p/F1p to the recent experimental data and static properties of the nucleon is studied within a light-front model with different spin coupling schemes and wave functions. The position of the zero of proton electric form factor is sensitive to the presence of a hard constituent quark component in the nucleo
Brazilian Journal of Physics. Publicado em: 2004-03