منابع مشابه
Coulombian disorder in Charge Density Waves
When unscreened charged impurities are introduced in charge density wave system the long wavelength component of the disorder is long ranged and dominates static correlation functions. We calculate the x-ray intensity and find that it is identical to the one produced by thermal fluctuations in a disorder-free smectic-A. We suggest that this effect could be observed in the blue bronze material K...
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We have studied numerically the dynamics of sliding charge-density waves ~CDW’s! in the presence of impurities in d51,2. The model considered exhibits a first-order dynamical transition at a critical driving force Fc between ‘‘rough’’ ~disorder dominated! (F,Fc) and ‘‘flat’’ (F.Fc) sliding phases where disorder is washed out by the external drive. The effective model for the sliding CDW’s in th...
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Low-temperature single-crystal neutron and X-ray diffraction data were collected for bullvalene (Figure 1). X —N Fourier and multipole static deformation electron density maps were calculated and compared. Atomic mean-square-displacement parameters were analysed in the framework of the rigid-body motion model and the residual amplitudes (UOBS — t/TLS) were graphically interpreted. The prelimina...
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We study the Euclidean two-point correlation function Gq(x) of the topological charge density in QCD. A general statement based on reflection positivity tells us that Gq(x) < 0 for x 6= 0. On the other hand the topological susceptibility χq = ∫ dxGq(x) is a positive quantity. This indicates that Gq(x) developes a positive contact term at x = 0, that contributes to the determination of the physi...
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C427 of the complexes has been investigated by theoretical calculations[2], but is still in controversy. Here we show the bonding nature of the 1zirconacyclopent-3-yne complex by means of experimental charge density analysis. Diffraction data were collected using synchrotron radiations at KEK PF-AR NW2 beam line by Rigaku Mercury CCD diffractometer up to sin / = 1.0 Å. Multipole expansion metho...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations and Advances
سال: 2016
ISSN: 2053-2733
DOI: 10.1107/s2053273316095358