Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.6: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

Synthesis and characterisation of superconducting and magnetic properties of RuSr₂Gd_1−xY_xCu₂O₈ — •Johannes Krämer, Eugenio Casini, and Hans F. Braun — Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth

It is well known that the formation of RuRE1212 (RE = rare earth) under ambient pressure is strongly affected by the size of the rare earth ion. The 1212 structure type forms just with RE = Gd, Eu and Sm. Under high pressure, the synthesis has been successful with the smaller elements Tb - Er and Y [1]. Under ambient conditions, the phase has been reported in solid solution systems RuSr₂Gd_1−xRE_xCu₂O₈ with RE = Dy - Er, Yb and Lu up to a maximum content of x = 0.7 [2].

In our work we investigated the partial substitution of Gd with the non-magnetic rare earth Yttrium. The samples were characterised using x-ray powder diffraction, scanning electron microscopy (SEM) and ac-susceptibility measurements. We observed a dependence of the superconducting transition temperature T_c as well as the lattice parameters on the Yttrium content. However, single-phase samples were not obtained.

[1] L.T. Yang et al., J. Solid State Chem. 177 (2004) 1072

[2] M. Abatal et al., Physica C 408-410 (2004) 185