Resonant x-ray scattering measurements on a ferrielectric liquid crystal phase
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We have performed resonant X-ray scattering on two bent-core liquid crystal compounds exhibiting the B2 phase using three sample geometries: free-standing film and two others with free surface arrangements. The results conclusively demonstrate the two-layer orientational periodicity in this phase suggested by optical studies. We have performed the first resonant scattering experiments on liquid crystals at the chlorine K-edge, opening up a new class of compounds for resonant X-ray scattering studies. Furthermore, we have achieved an excellent alignment of the B2 phase with a free surface.
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Synchrotron radiation has succeeded in determining the magnetic structure of many different materials in a microscopic scale.If the energy of the incident beam is tuned to the absorption edge of one of the elements of the sample, a resonant effect appears with a significant enhancement of the diffracted signal.Resonant X-ray Magnetic Scattering (RXMS) technique is based on this principle, which makes possible to distinguish the magnetic ordering of atoms of different species [1].RXMS also allows studying materials that are difficult to be studied by neutron diffraction due to large neutron absorption of some elements.At beamline P09 of PETRA III (DESY) different types of experiments to study magnetic phases through RXMS are currently available, as well as other experimental resources [2].However, the analysis of the collected data to determine the magnetic structure is complicated and there is no specific software dedicated to this technique.Here we present an ongoing project to develop the software called MagStReX (Magnetic Structures through Resonant X-ray Scattering), a program to facilitate the planning of a RXMS experiment, as well as to carry out the analysis of the data obtained in these experiments.An overview of the RXMS technique and the experiments mentioned above will be presented, together with the current status and the future development of MagStReX.
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phase transition from a paramagnetic to an antiferromagnetac to the strong neutron absorption of Eu, the resonant X-ray -
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The resonant multiple Bragg x-ray diffraction is used to study the forbidden $(10\overline{4})$ reflection in ${\mathrm{LaMnO}}_{3}$. Using the interference between the three-beam scattering and resonant scattering we can determine the phase of the resonant scattering. This phase is shown to be consistent with a model in which the resonant scattering is caused by the influence of the Mn-O bond length distortion rather than directly by the orbital ordering on the Mn $4p$ band structure.
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We studied the local layer structure in the B2 phase of bromine-substituted bent-core liquid crystals in the cell geometry using microbeam resonant x-ray scattering. In the homochiral state of B2 phase, the 3/2 order satellite peak was observed only when the incident x-ray energy is at the K absorption edge of bromine. This result clearly indicates that the B2 homochiral domain forms two-layer superlattice in adjacent layers, the same as in the rodlike Sm-C(A) phase. The work reports on microbeam resonant x-ray scattering experiment from the local layer of the bent-core liquid crystal in the device geometry. Moreover, we can say that bromine is also useful for the analysis of the superstructure of soft materials using resonant x-ray scattering.
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