Transport phenomena in Zn-substituted Bi2Sr2Ca1-xGdx (Cu1-yZny)2 O8+d

We had performed a study on magnetoresistivity, Hall, Nernst and Seebeck effects in the "mixed and normal state" for "Bi 2212" bulk, doped with Gd and Zn prepared by the conventional solid-state reaction method in magnetic field between 0 and 5T, and in the temperature range 5-300 K. The critical temperatures, the Hall, Nernst and Seebeck coefficients depend strongly on the Zn and Gd contents. Also we have found an anomalous suppression of superconductivity at x = 0.30-0.35 and y = 0.025-0.030, when the hole concentration per Cu is p(H) similar or equal to 1/8 and the transport properties exhibit less metallic behavior than usual. (C) 2000 Elsevier Science B.V. All rights reserved.