Publications by authors named "Ying-Yu Kung"
Revisiting LaSrMnO lattice distortion and charge ordering with multi-beam resonant diffraction.
Acta Crystallogr A Found Adv
January 2017
Article Synopsis
- The study investigates sinusoidal wave-type distortions in LaSrMnO during its low-temperature orthorhombic phase using a technique called multi-beam resonant X-ray diffraction (MRXD).
- Two types of four-beam diffractions with different asymmetries were analyzed at a specific energy level (6.5545 keV) and compared to theoretical simulations based on dynamical X-ray diffraction.
- The results highlight how MRXD can effectively reveal distortion modes that are related to the material's structure and demonstrate its sensitivity to changes in X-ray energy, particularly around the Mn K edge, which supports findings of charge differences between manganese sites.
This paper reports temperature- and energy-dependent phase shifts of resonant multiple-beam X-ray diffraction in germanium crystals, involving forbidden (002) and weak (222) reflections. Phase determination based on multiple-beam diffraction is employed to estimate phase shifts from (002)-based {(002)(375)(373̅)} four-beam cases and (222)-based { (222)(5̅33̅)} three-beam cases in the vicinity of the Ge K edge for temperatures from 20 K up to 300 K. The forbidden/weak reflections enhance the sensitivity of measuring phases at resonance.
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