Synthesis and Superconductivity in Ba-doped (Ru,Cu)(Sr,Nd)2(Nd,Ce)2Cu2O z Compounds

Effect of Cu Doping on the Crystal Structure of (Ru1−x Cu x )(Sr1.47Ba0.2Nd0.33)(NdCe)Cu2O10−δ

“…The procedure of heat treatments was the same as that applied earlier for preparing phase-pure (Ru 0.5 Cu 0.5 )(Sr 1.67−x Ba x Nd 0.33 )(Nd 1.34 Ce 0.66 )Cu 2 O 10−δ samples [11]. X-ray diffraction (XRD) was used to examine the phase purity of the samples by using a Bruker D5005 powder diffractometer and Cu Kα radiation at room temperature.…”

“…However, few structural studies [9,10] have been reported for the Nd-based Ru-1222 compounds, mainly because preparation of phase-pure Nd-based Ru-1222 compounds is much more difficult than for those of R = Gd, Eu, or Sm. Recently, it has been found that nearly-single-phase samples can be obtained in the nominal compositions of the (Ru 0.5 Cu 0.5 )(Sr 1.67−x Ba x Nd 0.33 )(Nd 1.34 Ce 0.66 )Cu 2 O 10−δ system [11]. To address the crystal structure of Nd-based Ru-1222 compounds and the role of Cu doping, polycrystalline samples with compositions of (Ru 1−x Cu x )(Sr 1.47 Ba 0.2 Nd 0.33 )(NdCe) Cu 2 O 10−δ were prepared and examined by using X-ray and neutron diffraction.…”