Magnetic properties of RuSr2RECu2O8 (RE=Gd, Eu) and Ru1−xSr2GdCu2+xO8−y superconductors
作者： P.W. Klamut , B. Dabrowski , S.M. Mini , M. Maxwell , S. Kolesnik
DOI: 10.1016/S0921-4534(01)00778-X
关键词: Paramagnetism 、 Magnetic susceptibility 、 Superconductivity 、 Magnetization 、 Valence (chemistry) 、 Condensed matter physics 、 XANES 、 Magnetic field 、 Materials science 、 Absorption edge
摘要: Abstract Synthesis in 1% oxygen at 930°C leads to non-superconducting RuSr 2 GdCu O 8 which superconductivity subsequently can be induced with annealings without observable stoichiometric changes. Detailed ac susceptibility and zero-field muon-spin rotation experiments reveal that the superconducting compounds always exhibit a lower temperature of magnetic transition larger values internal field ordered state Ru sublattice. The same oxygen, however, lead EuCu . properties newly discovered series 1− x Sr 2+ 8− y superconductors (maximum T c =72 K for =0.4) are reported. Low behavior magnetization shows significant contribution paramagnetic system Gd ions response below transition. Muon-spin presence transitions low temperatures XANES CuK absorption edge data show an increase Cu valence
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