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From an X-ray diffraction [1], the lattice constant of diluted magnetic semiconductor Zn1-xMnxTe linearly changes with varying x (Vegard’s law), while an XAFS results [2] showed almost unchanged Mn-Te and Zn-Te bond lengths (Pauling’s rule). This discrepancy led to a question of how the large the large MnTe4 tetrahedra can be squeezed into the small ZnTe4 lattice. X-ray fluorescence holography (XFH) is a new technique that allows one to investigate a three-dimensional local image around a specific element. The sample was irradiated by intense X-rays of certain energies beyond the Mn K absorption edge at BL37XU/SPring-8 in order to obtain the Mn K fluorescence hologram [3]. A three-dimensional atomic image around the Mn central atoms was derived from the hologram using Barton’s algorithm. The nearestand third-nearest-neighbour Te atoms were clearly visualized. However, the second-nearest-neighbour Zn or Mn atoms are barely visible in this image due probably to a highly distorted cation Zn(Mn) sub-lattice.

Investigation of LaMn2-xFexSi2(0 ≤x≤ 1.2) by magnetic measurements and neutron diffraction

Investigation of LaMn_2-xFe_xSi₂(0 ≤x≤ 1.2) by magnetic measurements and neutron diffraction