Quantum Critical Point, Scaling, and Universality in High Tc   [CaxLa(1-x)][Ba(2-c-x)La(c+x)]Cu3Oy
  Using charge transport observations on sintered ceramic samples of CLBLCO, we failed to observe the Quantum Critical Point (QCP) where it is expected. Experimental data relating Cooper pair density, electrical conductivity, and superconductivity critical temperature suggest that Homes' relation might need a more specific definition of 'sigma'. Transport observations on YBCO single crystals will resolve this question. 
B. Watkins, H. Chashka, Y. Direktovich, A. Knizhnik, Y. Eckstein