Magneto-Transport Properties of Doped RuSr$_2$GdCu$_2$O$_8$

Details Magneto-Transport Properties of Doped RuSr$_2$GdCu$_2$O$_8$ Magneto-Transport Properties of Doped RuSr$_2$GdCu$_2$O$_8$

2003-02-24

arxiv.org/abs/cond-mat/0302499v1

Physics

Condensed Matter

Superconductivity

10 pages, 7 figures, submitted to Phys. Rev. B., correspondence to J.Tallon@irl.cri.nz

Scientific paper

10.1103/PhysRevB.68.064514

RuSr$_2$GdCu$_2$O$_8$, in which magnetic order and superconductivity coexist with $T_{Magnetic}$$\gg$$T_c$, is a complex material which poses new and important questions to our understanding of the interplay between magnetic and superconducting (SC) order. Resistivity, Hall effect and thermopower measurements on sintered ceramic RuSr$_2$GdCu$_2$O$_8$ are presented, together with results on a broad range of substituted analogues. The Hall effect and thermopower both show anomalous decreases below $T_{Magnetic}$ which may be explained within a simple two-band model by a transition from localized to more itinerant behavior in the RuO$_2$ layer at $T_{Magnetic}$.

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