Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.22: Poster
Montag, 27. März 2006, 14:00–17:45, P1
Rare earth substitutions and phase diagram studies in the ruthenocuprate system — •Eugenio Casini1, Thomas P. Pagageorgiou2, Antonio Vecchione3, Consiglia Tedesco4, and Hans F. Braun1 — 1Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany — 2HochFeld-Magnetlabor Dresden, Forschungszentrum Rossendorf, D-01314 Dresden, Germany — 3INFM and Dipartimento di Fisica "ER Caianiello", Universitá di Salerno — 4Dipartimento di Chimica, Università di Salerno, I-84081 Baronissi (Salerno), Italy
Coexistence of superconductivity and magnetism in the ruthenocuprate compounds has been the object of many investigations. RuSr2GdCu2O8−δ is the most studied member of this class of materials and is the first and single known oxide in the quinary Sr-Gd-Ru-Cu-O system. Discording studies about the effect of the rare earth elements on the crystal structure and physical properties of these materials are reported. The formation of the RuSr2NdCu2O8−δ compound is investigated following different preparation paths. Under standard conditions with the reported nominal composition a three-phase mixture is obtained. The concurring phases are indentified as: (Sr1−xNdx)(Ru1−xCux)Oy, Sr2NdRuCuO7 and (Sr14−xNdx)Cu24O41. A characterization of these compounds is carried out by XRD, DTA and EDX analysis whereas superconducting and magnetic properties are determined with ac and dc susceptibility measurements. Magnetic transitions in the temperature range 10-20K and 20-30K are detected for the Sr2NdRuCuO7 and (Sr14−xNdx)Cu24O41 compounds, respectively. The Sr2NdRuCuO7 compound has not been previously reported.