We have synthesized Cu-substituted (Au,Cu)AlYb quasicrystals in order to investigate the relationship between the quasilattice constant and the magnetic property. The quasilattice constant aR is found to decrease as Au is replaced by Cu, and the maximum reduction of 2.18% in aR was observed for x = 0.60 in (Au1−xCux)49Al34Yb17. Magnetic measurements of (Au1−xCux)49Al34Yb17 (x = 0, 0.10, 0.20, 0.50) show that the intermediate-valence state of Yb persists in all the studied compositions. The eective magnetic moment is found to depend onr/aR rather than on the quasilattice constant aR. This suggests thatr/aR can be regarded as a measure of the chemical pressure induced on the Yb atoms.
A computer simulation technique was used to analyze the diffraction contrast of X-ray topographies obtained for an ADP single crystal containing twin boundaries. Diffraction contrast is sensitively affected by the total phase change of X rays occurring at the boundary. The result indicates that the twin configuration determined in a previous study is the most probable configuration both from the viewpoint of diffraction contrast and from the viewpoint of the invisibility criterion.
A dissipative axisymmetric pulsar magnetosphere is calculated by a direct numerical simulation of the strong-field electrodynamics equations. The magnetic separatrix disappears; it is replaced by a region of enhanced dissipation. With a better numerical scheme, one should be able to calculate the bolometric light curves for a given conductivity.
Statistical mechanics of quasi-geostrophic flows on a sphere deformation radius. Previous studies were restricted to flows in a planar domain with fixed or periodic boundary conditions with a beta-effect.In these different cases, we are able to classify the statistical equilibria for the large-scale flow through their macroscopic features. We build the phase diagrams of the system and discuss the relations of the various statistical ensembles.
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