Magnetotransport properties of dopedRuSr2GdCu2O8

Abstract

RuSr 2 GdCu 2 O 8 , in which magnetic order and superconductivity coexist with T mag ӷT c , is a complex material which poses new and important questions to our understanding of the interplay between magnetic and superconducting 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 analogs. The Hall effect and thermopower both show anomalous decreases below T mag , 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 mag .

Microwave and magnetotransport properties ofRuSr2RCu2O8(Požek1, Kupčić2, Dulčić3 et al. 2008Phys. Rev. B6100View full textAdd to dashboardCite

“…The magnetization [13] and NQR [14,15] results suggest that most of the electrons are localized resulting in Ru 4+ ions while magnetoresistivity and Hall measurements [2,16] suggest the existence of conductivity in magnetically ordered RuO 2 layers. We shall deal with this question in our doping study, where the number of charge carriers is modified by the replacement of Ru ions with Sn.…”

Superconductivity in magnetically ordered Ru1-xIr xSr2GdCu2O8 compounds

“…The ρ(T) data show that the electrical resistivity ρ(T) close to the onset of the critical temperature T c,onset ∼ 50 K is ∼ 10 mΩcm, a value within the range of other reported values for the pristine compound. [11][12][13] In addition, the commonly observed upturn in ρ(T) close to T c,onset is hardly seen in lightly doped samples, which attests to the high quality of the samples. However, an upturn in the x = 0.1 sample close to T c,onset is quite noticeable.…”

“…Some results regarding different cation substitutions in Ru-1212 have already been reported. [6,[10][11][12][13][14] However, only a fraction of them concern substitutions at the Ru site, in spite of their relevance, and given the currently unsolved configuration of spin and charge of Ru ions in Ru-1212 compounds. [11] Reported Ru substitutions include Sn +4 , Nb +5 , and Ta +5 .…”

“…[6,[10][11][12][13][14] However, only a fraction of them concern substitutions at the Ru site, in spite of their relevance, and given the currently unsolved configuration of spin and charge of Ru ions in Ru-1212 compounds. [11] Reported Ru substitutions include Sn +4 , Nb +5 , and Ta +5 . [10][11][12][13][14][15][16] More recently, Mo and Sb substitutions for Ru were performed on the Ru-1222 compounds and a competition of SC and magnetism was observed.…”

“…[11] Reported Ru substitutions include Sn +4 , Nb +5 , and Ta +5 . [10][11][12][13][14][15][16] More recently, Mo and Sb substitutions for Ru were performed on the Ru-1222 compounds and a competition of SC and magnetism was observed. [17,18] These experiments probe the effect of the changes in ionic radius, valence, and magnetic character of the substituting ion.…”