Coexistence of superconductivity and ferromagnetism in 1212 -
نویسندگان
چکیده
The coexistence of superconductivity and ferromagnetism in 1212-RuSr GdCu O is unique among high-T materials. Samples of 2 2 8 c Ru M Sr GdCu O , with M5Ti, V and Nb; and 0#x#1, were prepared to elucidate the role of the RuO planes in this interesting 1 2 x x 2 2 8 2 layered 1212 cuprate. The solubility ranges of M5Ti and V are limited to x,0.15 whereas that of Nb extends to full substitution. In all cases superconductivity is lost at higher substitution levels (x.0.2), however with vanadium substitution the T increases from 20 K to 25 c K. The ferromagnetism of the RuO layers is dramatically affected by the electronic configuration of the substituting ion, weakened for 2 M5Ti and Nb and enhanced for M5V. These results indicate that the superconductivity and ferromagnetism are intimately linked to the layered architecture of this 1212 structure. 2000 Elsevier Science Ltd. All rights reserved.
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