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- W2085665030 abstract "Chromium nitride (CrN) films were epitaxially grown on $ensuremath{alpha}text{ensuremath{-}}{mathrm{Al}}_{2}{mathrm{O}}_{3}(0001)$ and MgO (001) substrates by pulsed laser deposition at $973phantom{rule{0.3em}{0ex}}mathrm{K}$ under nitrogen radical irradiation, and the structural change of the films was investigated at around the N'eel temperature of CrN $(ensuremath{sim}270phantom{rule{0.3em}{0ex}}mathrm{K})$ by temperature-controlled x-ray diffraction experiments. Bulk cubic CrN is known to show monoclinic distortion below the N'eel temperature. The CrN film grown on MgO(001) with the CrN(001) plane parallel to the substrate surface, exhibited a clear structural change at around $260phantom{rule{0.3em}{0ex}}mathrm{K}$. On the other hand, on $ensuremath{alpha}text{ensuremath{-}}{mathrm{Al}}_{2}{mathrm{O}}_{3}(0001)$ substrates, the CrN phase grew with its (111) planes parallel to the substrate surface, and showed no structural change at the N'eel temperature. The different orientation of the epitaxial films can explain the different behavior of the films: The structural transition of bulk-CrN causes large variations in the interatomic distances and bond angles on the (111) plane, but varies little on the (001) plane. In the case of thin films, the $ensuremath{alpha}text{ensuremath{-}}{mathrm{Al}}_{2}{mathrm{O}}_{3}(0001)$ substrate surface could prevent the (111)-oriented film from distorting its structure by fixing atom positions on the CrN(111) interfaces of the film. In accordance with the structural behavior of the films, the (111)-oriented CrN film on $ensuremath{alpha}text{ensuremath{-}}{mathrm{Al}}_{2}{mathrm{O}}_{3}(0001)$ showed no anomaly in its metallic conductivity around the N'eel temperature. On the other hand, the (001)-oriented CrN on MgO showed a steep increase in electrical conductivity, accompanied by a lattice distortion below the N'eel point. These results highlight an example that epitaxy could be used to control the existence of structural transitions, further accompanied by an antiferromagnetic ordering, which is closely related to the electronic properties of materials." @default.
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- W2085665030 date "2007-02-22" @default.
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- W2085665030 title "Controlling the structural transition at the Néel point of CrN epitaxial thin films using epitaxial growth" @default.
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- W2085665030 doi "https://doi.org/10.1103/physrevb.75.054416" @default.
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