Since carrier doping of two-leg spin ladders can theoretically induce a superconductive state, investigation of such systems is of great use in the study of superconductivity. In this paper, we report the successful creation of a non-magnetic impurity doped into a two-leg molecular spin ladder and the characterization of its magnetic properties.

Interelectron interactions and correlations in quantum dots can lead to spontaneous symmetry breaking of the self-consistent mean field, resulting in the formation of Wigner molecules. With the use of spin-and-space unrestricted Hartree-Fock ~sS-UHF! calculations, such symmetry breaking is discussed for field-free conditions, as well as under the influence of an external magnetic field. Using a...

The method of obtaining pure polycrystalline silicon is described, followed by short accounts of how this material is converted into single-crystal form either by the Czochralski (cz) pulling method or the float-zone (FZ) method. It is shown that the silicon contains various impurities including oxygen, carbon, boron and possibly hydrogen. If a silicon nitride crucible is used instead of silica...

We analyze the influence of an impurity in the evolution of moving discrete breathers in a Klein–Gordon chain with non-weak nonlinearity. Three different behaviours can be observed when moving breathers interact with the impurity: they pass through the impurity continuing their direction of movement; they are reflected by the impurity; they are trapped by the impurity, giving rise to chaotic br...

An unknown impurity formed during stability sample analysis by a gradient reversed phase ultra-high pressure liquid chromatography (UHPLC) of varenicline tablets at 0.2% level. A simple isocratic preparative method was developed to isolate the unknown impurity with 20 min run time. This unknown impurity was identified and characterized by using spectroscopic techniques. Based on the spectral da...

We theoretically investigate defect formation energies in LaO$X$S$_2$ ($X=$Sb, Bi) using first-principles calculation. find that the oxygen vacancy is relatively stable, where its energy higher $X=$ Sb than Bi. An interesting feature of in-plane sulfur atom becomes more stable Bi, caused by an Sb$_2$ dimer and electron occupation impurity levels. The cation defects anion-cation antisite are pos...

In order to explore the effect of ZrH2 on electron emission performance rare earth tungsten electrodes (W-La-Y), different proportions were added in this study, and samples three obtained by ball milling vacuum hot-pressing sintering. The performance, phase evolution surface valence state analyzed, respectively. test results electrode show that increasing mass fraction range 0% 0.1% can continu...

the question of the purity or impurity of non-muslims has always attracted the attention of the islamic jurists. the importance of this question has been due to the fact that the social and political interactions between muslims and non-muslims were quite inevitable. the present article is concerned first to examine the notion of purity and impurity as viewed by the sunni and shiite jurists and...

Macroscopic description of the diffusion of interstitial impurity atoms considering the influence of elastic stress on the drift of interstitial species Abstract The diffusion equation for nonequilibrium interstitial impurity atoms taking into account their charge states and drift of all mobile interstitial species in the built-in electric field and in the field of elastic stress was obtained. ...

We study an Anderson impurity in a semiconducting host using the density matrix renormalization group technique. We use the U50 one-dimensional Anderson Hamiltonian at half filling as the semiconducting host since it has a hybridization gap. By varying the hybridization of the host, we can control the size of the semiconducting gap D . We consider chains with 25 sites and we place the Anderson ...