Abstract
The superconducting R1.4Ce0.6RuSr2Cu2O10−δ(R=Sm, Eu and Gd) withTc∼28, 32 and 42 K are also magnetically ordered atTN∼220, 122 and 180 K, respectively, thus,TN⪢Tc. This is in contrast to intermetallic magnetic superconductors (such as RNi2B2C) in whichTc⪢ TN. Magnetic susceptibility and Mossbauer spectroscopy show that superconductivity is confined to the CuO2planes, whereas magnetism is due to the Ru sublattice. Irreversibility phenomena and magnetic anomalies, observed at low magnetic fields originate from antisymmetric exchange coupling of the Dzyaloshinsky–Moria type, and from spin reorientation of the Ru moments. The shielding fraction is about 100%, supporting the conclusion that the materials consist of a single phase, manifesting both magnetism and superconductivity at once.
Published Version
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