新型稀土掺杂六方铜酸盐Ru1-xRexSr2GdCu2Oy的磁、电和结构性质
Magnetic, electrical and structural properties of the new Re-doped ruthenocuprate Ru1-xRexSr2GdCu2Oy
摘要：
尽管发现了新的超导体类别，但高Tc氧化物仍然是当前的主题，因为它们复杂的相图和掺杂依赖效应（允许研究轨道之间的相互作用），以及结构特性，如晶格畸变和电荷有序等。钌铜酸盐是磁性超导体，其中磁转变温度远高于临界超导温度，使其成为独特的化合物。为了研究磁性Ru亚晶格的稀释，我们提出了新的Ru 1-xRexSr 2GdCu 2 Oy钙钛矿型家族的合成，通过直接掺杂双钙钛矿，采用已知的两步过程（双钙钛矿+ CuO），从而获得新的钙钛矿化合物Sr 2GdRu 1-xRexOy，这代表了我们所知的新的合成工艺。我们的样品通过X射线衍射进行结构表征，并通过Rietveld细化分析图案。一个完整的磁特性作为温度和外加磁场的函数，以及运输测量进行。我们讨论了我们的结果在光的双晶格模型的超导铜，和RuO_2（磁性）和CuO_2（超导体）子晶格之间的关系可以清楚地观察到。
英文摘要：
Despite the discovery of new superconductors classes, high-Tc oxides continue to be a current topic, because of their complex phase diagrams and doping-dependant effects (allowing one to investigate the interaction between orbitals), as well as structural properties such as lattice distortion and charge ordering, among many others. Ruthenocuprates are magnetic superconductors in which the magnetic transition temperature is much higher than the critical superconducting temperature, making them unique compounds. With the aim of investigating the dilution of the magnetic Ru sub-lattice, we proposed the synthesis of the new Ru1-xRexSr2GdCu2Oy ruthenocupratetype family, adapting the known two-step process (double perovskite + CuO)by directly doping the double perovskite, thus obtaining the new perovskite compound Sr2GdRu1-xRexOy, which represents a new synthesis process to the best of our knowledge. Our samples were structurally characterised through X-ray diffraction, and the patterns were analysed via Rietveld refinement. A complete magnetic characterisation as a function of temperature and applied field, as well as transport measurements were carried out. We discuss our results in the light of the two-lattice model for ruthenocuprates, and a relation between RuO2 (magnetic) and CuO2 (superconductor) sublattices can clearly be observed.
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