Abstract
New phase of the Ru-based cuprate with 1232 structure has been synthesized in the RuSr2+xSmCe2−xCu2Oz system. The powder X-ray diffraction analysis shows that nearly the single phase can be formed in the x composition range from 0.0 to 0.2. The new phase has a tetragonal unit cell with the lattice parameters of about a=0.384 nm and c=1.70 nm. A bulk sample with x=0.2 shows two anomalies in resistivity at about 12 and 40 K. The former anomaly is considered to originate from the Ru-1232 phase. In temperature dependence of magnetization, the sample shows a diamagnetic signal at about 20 K and ferromagnetic order at about 80 K.
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