نتایج جستجو برای: xz spin
تعداد نتایج: 123380 فیلتر نتایج به سال:
The rich variety of iron-based superconductors and their complex electronic structure lead to a wide range of possibilities for gap symmetry and pairing components. Here we solve in the two-Fe Brillouin zone the full frequency-dependent linearized Eliashberg equations to investigate spin-fluctuations mediated Cooper pairing for LiFeAs. The magnetic excitations are calculated with the random pha...
The entanglement at zero-temperature is studied in a two-qubit XZ spin-1/2 chain model in anexternal magnetic field which is applied in the z direction. We have obtained an analytical relation forthe effect of the external magnetic field on the concurrence. It is shown that the ground state of thesystem depends on the strength of exchange coupling. We have shown that the analytical relation oft...
Bismuth is an archetypal semimetal with gigantic spin-orbit coupling and it has been a major source material for the discovery of seminal phenomena in solid state physics more than century. In recent years, spin current transports bismuth have also attracted considerable attention. this paper, we theoretically study both Hall effect (SHE) Nernst (SNE) bismuth, based on relativistic band structu...
Spin transition has attracted the interest of researchers in various fields since the early 1930s, with thousands of examples now recognized, including those in minerals and biomolecules. However, so far the metal centres in which it has been found to occur are almost always octahedral six-coordinate 3d(4) to 3d(7) metals, such as Fe(II). A five-coordinate centre is only rarely seen. Here we re...
The unconventional superconductor ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ has been the subject of enormous interest over more than two decades, but until now form its order parameter not explicitly determined. Since groundbreaking NMR experiments revealed recently that pairs are dominant spin-singlet character, attention focused on time-reversal symmetry breaking linear combinations $s$-, $d$-, a...
A two-orbital model for Fe-pnictide superconductors is investigated using computational techniques on two-dimensional square clusters. The hopping amplitudes are derived from orbital overlap integrals, or by band structure fits, and the spin frustrating effect of the plaquette-diagonal Fe-Fe hopping is remarked. A spin striped state is stable in a broad range of couplings in the undoped regime,...
A unified approach is presented for investigating coupled spin-orbital fluctuations within a realistic three-orbital model strongly spin-orbit systems with electron fillings $n=3,4,5$ in the $t_{2g}$ sector of $d_{yz},d_{xz},d_{xy}$ orbitals. generalized fluctuation propagator constructed which consistent self-consistent Hartree-Fock approximation where all Coulomb interaction contributions inv...
The present study has been carried out to understand the effect of electronic correlations on recently found fermions in CoSi. For which spectral functions bulk and (001) surface CoSi have investigated using DFT + DMFT advanced methodology at T = 100 K with without inclusion spin–orbit coupling (SOC). Co $${d_{xz}}$$ $${d_{yz}}$$ $$d_{z^2}$$ bands seem contribute threefold degenerate $$\Gamma $...
Two nonsymmetric search directions for semideenite programming, the XZ and ZX search directions, are proposed. They are derived from a nonsymmetric formulation of the semideenite programming problem. The XZ direction corresponds to the direct linearization of the central path equation XZ = I; while the ZX direction corresponds to ZX = I. The XZ and ZX directions are well deened if both X and Z ...
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