Recently, superconductivity was induced by expanding interlayer distance between Bi square nets in anti-ThCrSi-type YOBi through incorporation of excess oxygen with increased nominal amount of oxygen. However, such oxygen incorporation was applicable to only YOBi among ROBi ( R = rare earth metal), probably due to a larger amount of oxygen incorporation for YOBi. In this study, the interlayer distance in ErOBi was increased by cosintering with CaO, which served as an oxidant, indicating that excess oxygen was incorporated in ErOBi. As a result, superconductivity was induced in ErOBi at 2.2 K.
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