Chalk River Laboratories

About: Chalk River Laboratories is a based out in . It is known for research contribution in the topics: Neutron diffraction & Neutron scattering. The organization has 2297 authors who have published 2700 publications receiving 73287 citations.

Element-specific depth profile of magnetism and stoichiometry at the La0.67Sr0.33MnO3/BiFeO3 interface

Abstract: Depth-sensitive magnetic, structural, and chemical characterization is important in the understanding and optimization of physical phenomena emerging at the interfaces of transition metal oxide heterostructures. In a simultaneous approach we have used polarized neutron and resonant x-ray reflectometry to determine the magnetic profile across atomically sharp interfaces of ferromagnetic ${\mathrm{La}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_{3}$/multiferroic ${\mathrm{BiFeO}}_{3}$ bilayers with subnanometer resolution. In particular, the x-ray resonant magnetic reflectivity measurements at the Fe and Mn resonance edges allowed us to determine the element-specific depth profile of the ferromagnetic moments in both the ${\mathrm{La}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_{3}$ and ${\mathrm{BiFeO}}_{3}$ layers. Our measurements indicate a magnetically diluted interface layer within the ${\mathrm{La}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_{3}$ layer, in contrast to previous observations on inversely deposited layers [P. Yu et al., Phys. Rev. Lett. 105, 027201 (2010)]. Additional resonant x-ray reflection measurements indicate a region of altered Mn and O content at the interface, with a thickness matching that of the magnetic diluted layer, as the origin of the reduction of the magnetic moment.

Anomalous temperature dependence of the first diffraction peak in the superionic glass(AgI)x(AgPO3)1−x

Abstract: We report neutron-scattering measurements on the first sharp diffraction peak in the superionic conducting glass $(\mathrm{AgI}{)}_{x}({\mathrm{AgPO}}_{3}{)}_{1\ensuremath{-}x}$ as a function of composition x from 0.0 to 0.7. The temperature variation is studied in detail between 300 K and 500 K, a range that spans the calorimetric glass transition. This peak reflects structure in the phosphate network with periodicity $d\ensuremath{\approx}10\AA{}$ and correlation length $\ensuremath{\approx}25\AA{}.$ The intensity of the first sharp diffraction peak shows an anomaly as a function of temperature at a temperature about 6--11 % higher than ${T}_{g}$ as measured calorimetrically. This is tentatively ascribed to the diffraction intensity reflecting the onset of $\ensuremath{\alpha}$ relaxation, while the calorimetric data reflects the onset of $\ensuremath{\beta}$ relaxation.