The Superconductivity, Intragrain Penetration Depth and Meissner Effect   of RuSr2(Gd,Ce)2Cu2O10+delta
  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. 
Y. Y. Xue (1), B. Lorenz (1), A. Baikalov (1), D. H. Cao (1), Z. G. Li   (1), C. W. Chu (1, 2, 3) ((1) Department of Physics...