Low temperature synthesis and superconducting properties of polycrystalline T′-(La,Sm)2CuO4 |
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| Authors: | S Ueda S AsaiM Naito |
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| Institution: | Department of Applied Physics, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan |
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| Abstract: | La2−xSmxCuO4+δ with the Nd2CuO4 structure was synthesized by precipitation from fused alkaline hydroxide, CsOH, at 400 °C. The as-sintered polycrystalline samples showed no diamagnetic signal, but after post-annealing in vacuum of ≈10−8 atm at 650–700 °C, the samples with x = 0.1 and 0.3 exhibited superconductivity at Tc on = 25 K. The volume fraction of the superconducting phase estimated from the slope of the Zero-Field-Cooled magnetization data was over 30% for x = 0.3, which confirmed that the La1.7Sm0.3CuO4+δ is a bulk superconductor. |
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| Keywords: | La-based superconductor Nd2CuO4-type structure Bulk superconductor Alkaline hydroxides |
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