[7a-S42-1~11] 11.1 Fundamental properties

▲ [7a-S42-11] Phase content influence on superconducting and magnetic properties of doped Sr₂CaCu₂O₆ polycrystalline material

〇Anastasia Sklyarova¹, Takumi Naito¹, Hisayuki Suematsu¹ (1.Nagaoka Univ of Tech)

Keywords:superconductivity, magnetic properties, substitution effects

In this work phases composition and its influence on the observed superconducting and magnetic properties of Fe/Eu-doped polycrystalline Sr₂CaCu₂O₆ have been studied. Using the standard high-pressure synthesis method pure Sr₂CaCu₂O₆ was obtained. According to the previous research results [1-3] the mixture of presynthesized SrCuO₂, Ca₂CuO₃, SrO₂, and commercial CuO precursors were placed into gold capsule and annealed at 875-1000 ^oC with applying of 5.5 GPa isotropic pressure. For the obtaining of substituted materials stoichiometric quantity of Fe₂O₃ or Eu₂O₃ commercial powder was added into the precursor’s mixture. Instability of the main 0^(Sr)212 phase during the synthesis process is cause the careful selection of the synthesis conditions. Thorough study of structure and properties of obtained substituted materials showed the unexpected phase quantities redistribution and phase-dependent coexistence between low-temperature magnetism and superconductivity.