RESISTIVE AND MAGNETIC-ANOMALIES IN HIGH T-C CUPRATES

After the discovery of new high Te superconducting families [1-3], the possibility of Te close to room temperature is reexamined. Some diama gnetic and resistive contributions are clearly associated with superco nducting fluctuations [4] extending up to 200K or more in Hg [5] and C u cuprates. The possibility of traces of high temperature (T-c>250K) s uperconducting phases is also suggested by resistive and magnetic anom alies. However, resistive anomalies are not very reproducible due to a geing effects at room temperature, and paramagnetic contributions ofte n dominate what could be considered as the onset of diamagnetism.