Polycrystalline samples of YSr2Cu2.75Mo0.25O7+δ with different oxygen contents are investigated by powder X‐ray diffraction and selected area electron diffraction. The temperature dependence of resistivity and the oxygen content are determined. The air‐sintered sample is tetragonal and semiconductive, while the O2‐sintered sample is orthorhombic and superconducting at 26 K. It is suggested that the structural variation originates from the (Cu(1), Mo)O1+δ layers and the superconductivity is induced by the excess oxygen rather than charge redistribution between Cu(1) and Cu(2).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics