The Superconductivity, Intragrain Penetration Depth and Meissner Effect of RuSr2(Gd,Ce)2Cu2O10+delta

Abstract

The hole concentration (p)(delta), the transition temperature Tc, the intragrain penetration depth lambda, and the Meissner effect were measured for annealed RuSr2(Gd,Ce)2Cu2O10+delta samples. The intragrain superconducting transition temperature Tc} varied from 17 to 40 K while the p changed by only 0.03 holes/CuO2. The intragrain superfluid-density 1/lambda^2 and the diamagnetic drop of the field-cooled magnetization across Tc (the Meissner effect), however, increased more than 10 times. All of these findings are in disagreement with both the Tc vs. p and the Tc vs. 1/lambda^2 correlations proposed for homogeneous cuprates, but are in line with a possible phase-separation and the granularity associated with it.

7 pages, 6 figures, accepted for publication in Phys. Rev. B (May 2, 2002)

References in corpus (4)

• Evidence for Possible Phase-Separations in RuSr2(Gd,Ce)2Cu2O10-delta
• Penetration Depth and Anisotropy in MgB2
• Magnetic Properties of RuSr2RECu2O8 (RE=Gd, Eu) and Ru1-xSr2GdCu2+xO8-y Superconductors
• Unusual Field-Dependence of the Intragrain Superconductive Transition in RuSr2EuCu2O8

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