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

TL;DR

This study investigates the electrical transport properties of doped RuSr$_2$GdCu$_2$O$_8$, revealing how magnetic ordering influences conductivity and carrier behavior through resistivity, Hall effect, and thermopower measurements.

Contribution

It provides new insights into the interplay between magnetic order and superconductivity in RuSr$_2$GdCu$_2$O$_8$ and its analogues using comprehensive transport measurements.

Findings

Hall effect and thermopower decrease below magnetic transition temperature

Transition from localized to itinerant behavior in RuO$_2$ layer at magnetic ordering

Anomalous transport behavior linked to magnetic and electronic interactions

Abstract

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 $T_{Magnetic}$.