Structure and Morphology of NdSr2RuCu2Oy and GdSr2RuCu2Oz

Marchese, Leonardo; Vecchione, A.; Gombos, M.; Tedesco, Consiglia; Frache, Alberto; Pastore, Heloise O.; Pace, S.; Noce, Canio

doi:10.1007/3-540-45814-x_14

Cited by 3 publications

(1 citation statement)

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“…It appeared to be isostructural to the layered RuGd1212 and a magnetic ordering transition at temperature below 150 K is detected [57]. A compound of RuNd1212 composition was reported with a disordered cubic structure due to the trend of the Nd 3+ ions to substitute on the alkaline earth ion site [59,60]. Neither a superconducting transition nor magnetic ordering were detected [59].…”

Section: Rare Earth Substitutionsmentioning

confidence: 97%

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: Rare Earth Substitutionsmentioning

confidence: 97%

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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High Tc superconductors for plasmonics and metamaterials fabrication: A preliminary normal state optical characterisation of Nd123 and Gd1212

Gombos

Romano

Rendina

et al. 2013

Journal of Applied Physics

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The application of metamaterials and plasmonic structures in the visible and near infrared are strongly limited by the dissipative losses due to the low conductivity of the most used metals in this frequency range. High temperature superconductors are plasmonic materials at nonzero temperature that can provide a possible alternative approach to overcome this limit. Moreover, they can have zero or even negative dielectric constant, and a bipolar behavior. All these characteristics are attractive for plasmonic applications, and encourage further studies aimed at a more detailed knowledge of the parameters characterizing high temperature superconductors as possible optical materials. In this paper, Fourier Transform Infrared Spectroscopy analysis and ellipsometric measurements in the visible and infrared spectral regions on NdBa2Cu3O7−δ (Nd123) and ruthenocuprate superconductor GdSr2RuCu2O8−δ (Gd1212) are reported. As a matter of fact, Nd123 presents the highest transition temperature (Tc = 96 K) and the most interesting magnetic response properties among YBCO-like cuprate superconductors, whereas the coexistence in the same cell of superconductivity and magnetic order below Tc in Gd1212 can be an interesting feature for next metamaterial-like applications. The obtained results confirm the promising features of the considered materials.

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