Physics – Condensed Matter – Superconductivity
Scientific paper
2001-04-13
Physica C 364-365 (2001) 313-319
Physics
Condensed Matter
Superconductivity
to be published in Physica C, Proceedings of New 3SC-3 Int.Conf., January 15-19, 2001, Honolulu, HI
Scientific paper
10.1016/S0921-4534(01)00778-X
Synthesis in 1% oxygen at 930C leads to non-superconducting RuSr2GdCu2O8 in which superconductivity subsequently can be induced with oxygen 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 the magnetic transition and larger values of the internal magnetic field in the ordered state of the Ru sublattice. The same annealings in oxygen, however, lead to non-superconducting RuSr2EuCu2O8. The magnetic properties of a newly discovered series of Ru1-xSr2GdCu2+xO8-y superconductors (maximum Tc=72 K for x=0.4) are reported. Low temperature behavior of the magnetization shows a significant contribution of the paramagnetic system of Gd ions to the magnetic response below the superconducting transition. Muon-spin rotation experiments reveal the presence of bulk magnetic transitions at low temperature for compounds with x<=0.4. XANES Cu-K absorption edge data show an increase in Cu valence with x.
Dabrowski Bogdan
Gebhardt Jeff
Graber Tim
Keller Hugo
Khasanov Rustem
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