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(a) Crystal structure of . Oblique parallelepiped and shaded horizontal plane represent a unit cell and its unit -plane, respectively. (b) Atomic arrangement of with  projection. (c) Atomic arrangement of with  projection. Threefold epitaxial relationship is shown by the unit -plane of . (d) Mirror variant domains of on substrate.
XRD patterns of films on (a) (111) and (b) sapphire (0001) substrates. The asterisk denotes a forbidden sapphire (0003) peak that appeared after the film growth.
(a) Reciprocal space contour map around (-204) and (226) diffractions. (b) Reciprocal space contour map around (-1-15) diffraction. (c) Pole figures of (-111) and (311) showing six poles at and three poles at , respectively.
Absorption spectra of a thin film on substrate. The spectra are shifted vertically for convenience. Inset shows a schematic energy diagram representing characteristic optical transitions denoted as A–C.
Temperature dependence of curves of a thin film on substrate. The magnetic field was along the -plane. Inset shows the data with the magnetic field applied normal to the -plane.
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