High magnetic field study of RuSr2GdCu2O8

Papageorgiou, Thomas; Casini, E.; Skourski, Y.; Herrmannsdörfer, T.; Freudenberger, J.; Braun, H. F.; Wosnitza, J.

doi:10.1088/1742-6596/51/1/095

Cited by 1 publication

(1 citation statement)

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“…While the effect of Ru loss or Ru uptake is evident, the heat treatment time of 20 h obviously was not sufficient to establish equilibrium in the volume of these samples. Pulsed-field magnetization measurements reveal a higher Ru moment for a sample treated in O 2 /RuO x flow, indicative of a higher fraction of Ru 5+ in this sample as compared to a sample treated only in oxygen atmosphere [55,71,72].…”

Section: Ru Contentmentioning

confidence: 83%

Effect of chemical composition on superconductivity and magnetism in layered ruthenocuprates

Casini

Kempf

Krämer

et al. 2009

J. Phys.: Condens. Matter

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The ruthenium-based layered cuprates RuSr(2)GdCu(2)O(8) (RuGd1212) can be considered naturally occurring magnetic and superconducting multilayer systems. We have concentrated on the preparation of RuGd1212-type compounds with nominally stoichiometric composition under ambient pressure conditions. For small rare earth ions R = Gd, Eu (and Sm), single phase compounds are obtained with the typical ordered layered structure and no significant changes of physical properties. With large rare earth ions (R = Nd, Pr), multiphase samples are obtained. In these cases, no ordered layered structure was observed. The effect of substituting Sr(2+) with the smaller Ca(2+) and larger Ba(2+) is examined. A different number and different types of phases in equilibrium are found with different alkaline earths (A = Ca, Sr, Ba) at the nominal RuA(2)NdCu(2)O(8) composition. The variation in the mismatch of the A/Nd size does not lead to the formation of an ordered layered RuA(2)NdCu(2)O(8) compound. Chemical transport in an open system was used to vary the Ru content in the RuGd1212 samples during the annealing step. With an increase of the Ru mass transport to the sample, the composition can be driven beyond the limit of the homogeneity range. Systematic changes in the phase composition of the resulting sample were observed. The magnetic and superconducting transition temperatures vary in a systematic way and are attributed to a variation of the Ru content in the RuR1212 phase.

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Section: Ru Contentmentioning

confidence: 83%