Experiments on electon and hole doped hig Tc copper oxide superconductors

M. B. MAPLE; N. Y. AYOUB; J. BEILLE; T. BJORNHOLM; Y. DALICHAOUCH; E. A. EARLY; S. GHAMATY; B. W. LEE; J. T. MARKERT; J. J. NEUMEIER; G. NIEVA; L. M. PAULIUS; I. K. SCHULLER; C. L. SEAMAN; P. K. TSAI

Conferencia; ICTPS '90 Internatiional Conference on Transport Properties o Superconductors; 1990

Experiments on hole-doped YPrBaCuO and electron -doped LnMCuO (Ln= Pr, Nd, Sm, Eu, Gd,; M=Ce, Th; y~0.02) compounds are briefly reviewed. The hole-doped YPrBaCuO system exhibit a rich variety of phenomena including a metal-insulator transition at x~0.6, high Tc superconductivity, anomalous behavior of the pressure dependence of Tc and the temperature dependence of the upper critical field, antiferromagnetic ordering of Cu+2 and pr ions, kondo like specific heat anomalies and enormous electronic specific heat coeficients. The un