نتایج جستجو برای: impurity scattering
تعداد نتایج: 123561 فیلتر نتایج به سال:
The spin fluctuation spectra from nonsuperconducting Cu-substituted, and superconducting Co-substituted, BaFe(2)As(2) are compared quantitatively by inelastic neutron scattering measurements and are found to be indistinguishable. Whereas diffraction studies show the appearance of incommensurate spin-density wave order in Co and Ni substituted samples, the magnetic phase diagram for Cu substitut...
Temperature and doping dependencies of electron mobility in InP, GaP and Ga0.52In0.48P structures have been calculated using an iterative technique. The following scattering mechanisms, i.e, impurity, polar optical phonon, acoustic phonon and piezoelectric are included in the calculation. Ionized impurity scattering has been treated beyond the Born approximation using the phaseshift analysis. I...
The thickness dependence of the magnetoresistance and the Hall constant is obtained in the twoband model with compensating charge carriers by using a specific perturbation formalism for quasitwo-dimensional systems. Screened impurity scattering is considered within the Boltzmann kinetic equation scheme, and the relaxation time is evaluated as a function of thickness through the scattering ampli...
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We derive the ratio of transport and single-particle relaxation times in threeand two-dimensional electron gases due to scattering from charged dislocations in semiconductors. The results are compared to the respective relaxation times due to randomly placed charged impurities. We find that the ratio is larger than the case of ionized impurity scattering in both threeand two-dimensional electro...
Resonant soft X-ray Raman scattering measurements on NiO have been made at photon energies across the Ni 2p absorption edges. The details of the spectral features are identified as Raman scattering due to d−d and charge-transfer excitations. The spectra are interpreted within the single impurity Anderson model, including multiplets, crystal-field and charge-transfer effects. At threshold excita...
When subject to a weak magnetic impurity distribution, the order parameter and quasi-particle energy gap of a weakly disordered bulk s-wave superconductor are suppressed. In the Born scattering limit, recent investigations have shown that ‘optimal fluctuations’ of the random impurity potential can lead to the nucleation of ‘domains’ of localised states within the gap region predicted by the con...
Using the bosonization technique, we have studied a spin-1/2 magnetic impurity in Heisenberg chain, and shown that the impurity specific heat and spin susceptibility have an anomalous temperature dependence. The temperature dependence of the impurity specific heat is: Cim(T ) ∼ T μ, μ = 4− 1 g (1− g)2, for gc < g < 1. The impurity spin susceptibility has the following temperature dependence: χi...
We will present brief overview on the electronic and transport properties of graphene nanoribbons focusing on the effect of edge shapes and impurity scattering. The low-energy electronic states of graphene have two non-equivalent massless Dirac spectrum. The relative distance between these two Dirac points in the momentum space and edge states due to the existence of the zigzag type graphene ed...
We demonstrate that scattering of particles strongly interacting in three dimensions (3D) can be suppressed at low energies in a quasi-one-dimensional (1D) confinement. The underlying mechanism is the interference of the s- and p-wave scattering contributions with large s- and p-wave 3D scattering lengths being a necessary prerequisite. This low-dimensional quantum scattering effect might be us...
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