NDLI: The Characteristics of the Superconducting and Magnetic Phases in the Polycrystalline Samples of Ruthenocuprates of Nominal Compositions RuSr$_{2}$GdCu$_{2}$O$_{8}$, Ru$_{0.98}$Sr$_{2}$GdCu$_{2}$O$_{8}$ and Ru$_{0.5}$Sr$_{2}$GdCu$_{2.5}$O$

Content Provider	Springer Nature Link
Author	Klamut, Piotr W. Plackowski, Tomasz Matusiak, Marcin
Copyright Year	2010
Abstract	The temperature dependencies of the resistivity for the superconducting ruthenocuprates of nominal compositions RuSr$_{2}$GdCu$_{2}$O$_{8}$, Ru$_{0.98}$Sr$_{2}$GdCu$_{2}$O$_{8}$ and Ru$_{0.5}$Sr$_{2}$GdCu$_{2.5}$O$_{8−δ }$ were examined for the magnetic field dependent characteristics of the superconducting transitions. The effect of the insignificant diminishing of the Ru/Cu ratio in parent RuSr$_{2}$GdCu$_{2}$O$_{8}$ was confirmed as relevant for the stabilisation of the superconducting phase. Noted differences in the compared characteristics are interpreted for possible inhomogeneous nucleation of the superconducting phase in the parent ruthenocuprate. The phase anisotropy in RuSr$_{2}$GdCu$_{2}$O$_{8}$ and Ru$_{0.98}$Sr$_{2}$GdCu$_{2}$O$_{8}$, in presence of the compounds Ru magnetism, appears to be a cause of a significant softening of the H $_{c2}$(T) phase line. An anomalous lowering of the magnetoresistivity was observed in the approx. 10 K range above the onset of the superconducting transition, which may suggest the presence of enhanced superconducting fluctuations in the samples.The positive magnetic field shift of the temperatures, which limit the magnetoresistivity and the specific heat signatures of the magnetic ordered state of the Ru sublattice, suggests probing the influence of the ferromagnetic Ru interactions in an effective metallic-like conduction channel present in the samples.Superconducting characteristics of the Ru$_{0.5}$Sr$_{2}$GdCu$_{2.5}$O$_{8−δ }$ reveal a significant contribution of the Gd paramagnetic signal at low temperatures, interpreted for the presence of a significant anisotropy of the superconducting phase. It is concluded that the Ru–Cu substituted phases of ruthenocuprates may present an opportunity to investigate the effectively anisotropic superconducting phase despite its comparatively high T $_{c}$ in the compounds related to the 123-type cuprate superconductor.
Starting Page	576
Ending Page	591
Page Count	16
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	159
Issue Number	5-6
e-ISSN	15737357
Language	English
Publisher	Springer US
Publisher Date	2010-03-17
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	1212-type ruthenocuprate High temperature superconductivity Magnetic and superconducting cuprates Magnetism, Magnetic Materials Characterization and Evaluation of Materials Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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