Single-Crystal Thin Films of SrFeO2 and LaNiO2 with Infinite-Layer Structures


Infinite-layer-structure epitaxial thin films of SrFeO2 and LaNiO2 respectively were prepared by low-temperature reduction with CaH2 from brownmillerite SrFeO2.5 and perovskite LaNiO3 epitaxial thin films grown on single-crystal substrates. The reduction process, removing oxygen ions from the perovskite-structure framework and causing rearrangements of oxygen ions, topotactically transforms the initial compounds to the c-axis oriented infinite-layer-structure epitaxial thin films. Consequently, the oxidation state of transition-metal ions in the film changed in wide ranges.

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Correspondence to Yuichi Shimakawa.

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Shimakawa, Y., Inoue, S., Kawai, M. et al. Single-Crystal Thin Films of SrFeO2 and LaNiO2 with Infinite-Layer Structures. MRS Online Proceedings Library 1148, 708 (2008).

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